User:Ioe bidome/Phonological history of Old English

Phonological processes
A number of phonological processes affected Old English in the period before the earliest documentation. The processes affected especially vowels and are the reason that many Old English words look significantly different from related words in languages such as Old High German, which is much closer to the common West Germanic ancestor of both languages. The processes took place chronologically in roughly the order described below (with uncertainty in ordering as noted).

Absorption of nasals before fricatives
This is the source of such alternations as modern English five, mouth, us versus German fünf, Mund, uns. For detail see Ingvaeonic nasal spirant law.

First a-fronting
The Anglo-Frisian languages underwent a sound change in their development from Proto-West-Germanic by which ā, unless followed by or nasalized, was fronted to ǣ. This was similar to the later process affecting short a, which is known as Anglo-Frisian brightening or First Fronting (see below). Nasalized ą̄ and the sequences ān, ām were unaffected and were later raised to ǭ, ōn, ōm (see below). (This may be taken to imply that a nasal consonant n, m caused a preceding long vowel to nasalise.) In the non-West-Saxon dialects of English (including the Anglian dialect underlying Modern English) the fronted vowel was further raised to ē : W.S. slǣpan, sċēap (< Proto-West-Germanic *slāpąn, *skāpă < Proto-Germanic *slēpaną, skēpą) versus Anglian slēpan, sċēp. The Modern English descendants sleep and sheep reflect the Anglian vowel; the West Saxon words would have developed to *sleap, *sheap.

The vowel affected by this change, which is reconstructed as being a low back vowel ā in Proto-West-Germanic, was the reflex of Proto-Germanic. It is possible that in Anglo-Frisian, Proto-Germanic /ɛː/ simply remained a front vowel, developing to Old English ǣ or ē without ever passing through an intermediate stage as the back vowel [ɑː]. However, borrowings such as Old English strǣt from Latin strāta (via) and the backing to ō before nasals are much easier to explain under the assumption of a common West Germanic stage *ā.

Monophthongization
Proto-Germanic /ai/ was monophthongized (smoothed) to. This occurred after first a-fronting. For example, Proto-Germanic *stainaz became Old English stān (modern stone) (cf. Old Frisian stēn vs. Gothic stáin, Old High German stein). In many cases, the resulting was later fronted to  by i-mutation: lǣfan "leave" [Modern English leave] (cf. Old Frisian lēva vs. Gothic bi-laibjan, Old High German leiben). It is possible that this monophthongization occurred via the height harmonisation that produced the other diphthongs in Old English (presumably through an intermediate stage: >  > ).

Second a-fronting
The second part of a-fronting, called Anglo-Frisian brightening or First Fronting, is very similar to the first part except that it affects short a instead of long ā. Here a is fronted to æ  unless followed by  or nasalized, the same conditions as applied in the first part.

Importantly, a-fronting was blocked by n, m only in stressed syllables, not unstressed syllables, which accounts for forms like ġefen (formerly ġefæn) "given" from Proto-Germanic *gebanaz. However, the infinitive ġefan retains its back vowel due to a-restoration (see the explanation given in that section for the similar case of faren vs. faran).

Diphthong height harmonisation
Proto-Germanic had the closing diphthongs (and, an allophone of  when an  or  followed in the next syllable). In Old English, these (except, which had been monophthongised, as noted above) developed into diphthongs of a generally less common type in which both elements are of the same height, called height-harmonic diphthongs. This process is called diphthong height harmonisation. Specifically:
 * underwent a-fronting to and was then harmonised to, then , spelled ǣa, which later simplified to ea (or in modern texts ēa).
 * was harmonised to, spelled eo (or in modern texts ēo).
 * was already harmonic; it became a separate phoneme, spelled io (or in modern texts īo). (This interpretation is somewhat controversial; see below.)

Old English diphthongs also arose from other later processes, such as breaking, palatal diphthongisation, back mutation and i-mutation, which also gave an additional diphthong ie. The diphthongs could occur both short (monotonic) and long.

Some sources reconstruct other phonetic forms that are not height-harmonic for some or all of these Old English diphthongs. The first elements of ēa, ēo, īo are generally accepted to have had the qualities [æ], [e], [i] (evidence for these qualities comes from the behaviour of breaking and back mutation as described below; the Middle English development of short ea into could also provide some evidence for the phonetic realisation of ēa). However, the interpretations of the second elements of these diphthongs are more varied. There are analyses that treat all of these diphthongs as ending in a schwa sound [ə]; i.e. ēa, ēo, īo = [æə], [eə], [iə]. For io and ie, the height-harmonic interpretations and  are controversial, with many (especially more traditional) sources assuming that the pronunciation matched the spelling, and hence that these diphthongs were of the opening rather than the height-harmonic type. In Early West Saxon, and later in Anglian io (both long and short) merged with eo.

Breaking and retraction
Vowel breaking in Old English is the diphthongization of the short front vowels to short diphthongs  when followed by,  or by  or  plus another consonant. Long similarly broke to, but only when followed by. The geminates rr and ll usually count as r or l plus another consonant. Breaking does not occur before ll produced by West Germanic gemination (the /i/ or /j/ in the following syllable prevents breaking).

In some dialects was backed (retracted) to   rather than broken, when occurring in the circumstances described above that would normally trigger breaking. This happened in the dialect of Anglia that partially underlies Modern English, and explains why Old English ceald appears as Modern English "cold" (actually from Anglian Old English cald) rather than "*cheald" (the expected result of ceald).

were lowered to in Early West Saxon and late Anglian (see above).

The exact conditions for breaking vary somewhat depending on the sound being broken: All short front vowels and and  (Which had raised to  in some dialects) break before Only short vowels broke before rC
 * feoh "money" < *fehaz
 * feaht "fought (sing.)" < *faht
 * lēon "to lend" < < *līhan
 * miox "dung" < *mihs

Examples:
 * weorpan "to throw" <
 * wearp "threw (sing.)" <
 * healp "helped (sing.)" <  (but no breaking in helpan "to help" because the consonant after  is not )
 * feorr "far" <
 * feallan "to fall" <  (but tellan < earlier */ˈtælljan/ is not broken because of the following /j/)
 * eolh "elk" <
 * liornian, leornian "to learn" < earlier */ˈlirnoːjan/
 * nēah "near" (cf. "nigh") <

The i-mutation of broken (whether long or short) is spelled ie (possibly, see above).

Examples:
 * hwierfþ "turns" (intr.) < + i-mutation <  + breaking < Proto-Germanic  < early Proto-Germanic *hwerbiþi
 * hwierfan "to turn" (tr.) < + i-mutation <  + breaking <  + a-fronting < Proto-Germanic *hwarbijaną
 * nīehst "nearest" (cf. "next") < + i-mutation <  + breaking <  + a-fronting < Proto-Germanic *nēhist
 * līehtan "to lighten" < + i-mutation <  + breaking < Proto-Germanic *līhtijaną

Both breaking and retraction are fundamentally phenomena of assimilation to a following velar consonant. While is in fact a velar consonant,, , and  are less obviously so. It is therefore assumed that, at least at the time of the occurrence of breaking and retraction (several hundred years before recorded Old English), was pronounced  or similar – at least when following a vowel – and  and  before a consonant had a velar or retroflex quality and were already pronounced  and, or similar.

A-restoration
After breaking occurred, short (and in some dialects long  as well) was backed to   when there was a back vowel in the following syllable. This is called a-restoration, because it partly restored original, which had earlier been fronted to (see above). (Note: The situation is complicated somewhat by a later change called second fronting, but this did not affect the standard West Saxon dialect of Old English.)

Because strong masculine and neuter nouns have back vowels in plural endings, alternations with in the singular vs.  in the plural are common in this noun class:

A-restoration occurred before the *ō of the weak verb suffix *-ōj-, although this surfaces in Old English as the front vowel i, as in macian "to make" < *makōjan-.

Breaking (see above) occurred between a-fronting and a-restoration. This order is necessary to account for words like slēan "to slay" (pronounced ) from original *slahan: >  (a-fronting) >  (breaking; inhibits a-restoration) >  (h-loss) >  (vowel coalescence, compensatory lengthening).

A-restoration interacted in a tricky fashion with a-fronting (Anglo-Frisian brightening) to produce e.g. faran "to go" from Proto-Germanic *faraną but faren "gone" from Proto-Germanic *faranaz. Basically: Note that the key difference is in steps 3 and 4, where nasalised ą is unaffected by a-fronting even though the sequence an is in fact affected, since it occurs in an unstressed syllable. This leads to a final-syllable difference between a and æ, which is transferred to the preceding syllable in step 4. The presence of back a in the stem of both forms is not directly explainable by sound change, and appears to have been the result of simple analogical levelling.

Palatalization
Palatalization of the velar consonants and  occurred in certain environments, mostly involving front vowels. (The phoneme at that time had two allophones:  after  or when geminated, and  everywhere else.) This palatalisation is similar to what occurred in Italian and Swedish. When palatalised:
 * became /tʃ/
 * became /ʃ/
 * became [dʒ]
 * became [ʝ] (a voiced palatal fricative; it would later become [j], but not before the loss of older in certain positions discussed below)

The contexts for palatalisation were sometimes different for different sounds:
 * Before, for example:
 * ċīdan ("to chide"), bēċ ("books", from earlier *bōkiz/), sēċan ("seek", from earlier *sōkijaną)
 * bryċġ ("bridge", from earlier West Germanic *ˈbruɡɡju after Proto-Germanic *brugjō)
 * ġiefþ ("gives")
 * Before other front vowels and diphthongs, in the case of word-initial and all, for example:
 * ċeorl ("churl"), ċēas ("chose (sg.)"), ċeald ("cold") (initial )
 * ġeaf ("gave"), ġeard ("yard")
 * After (possibly with an intervening /n/), unless a back vowel followed, for example:
 * iċ ("I"), dīċ ("ditch, dike")
 * In wicu ("week"), the is not affected due to the following
 * For and /sk/ only, after other front vowels, unless a back vowel followed, for example:
 * weġ ("way"), næġl("nail"), mǣġ ("relative")
 * fisċ ("fish")
 * In wegas ("ways") the is not affected due to the following
 * In āscian ("ask", from earlier *aiskōjaną) the remains due to the /ō/
 * For word-initial /sk/, always, even when followed by a back vowel or, for example:
 * sċip ("ship"), sċuldor ("shoulder"), sċort ("short"), sċrūd ("dress", giving modern shroud)

The palatals and  reverted to their non-palatal equivalents  and  when they came to stand immediately before a consonant, even if this occurred at a significantly later period, as when *sēċiþ ("seeks") became sēcþ, and *senġiþ ("singes") became sengþ.

Palatalization occurred after a-restoration and before i-mutation (although it is unclear whether it occurred before or after h-loss). Thus, it did not occur in galan "to sing" (cf. modern English regale), with the first backed from  due to a-restoration. Similarly, palatalisation occurred in dæġ ("day"), but not in a-restored dagas ("days"; cf. dialectal English dawes "days") or in dagung ("dawn", where the represents the reflex of unpalatalised ). Nor did it occur in cyning ("king"), cemban ("to comb") or gēs ("geese"), where the front vowels developed from earlier  due to i-mutation.

In many instances where a ċ/c, ġ/g, or sċ/sc alternation would be expected within a paradigm, it was levelled out by analogy at some point in the history of the language. For example, the velar of sēcþ "he seeks" has replaced the palatal of sēċan "to seek" in Modern English; on the other hand, the palatalised forms of besēċan have replaced the velar forms, giving modern beseech.

The sounds and  had almost certainly split into distinct phonemes by Late West Saxon, the dialect in which the majority of Old English documents are written. This is suggested by such near-minimal pairs as drincan ("drink") vs. drenċan  ("drench"), and gēs  ("geese") vs. ġē  ("you"). Nevertheless, there are few true minimal pairs, and velars and palatals often alternate with each other in ways reminiscent of allophones, for example: The voiced velars and  were still allophones of a single phoneme (although by now  was the form used in initial position); similarly, their respective palatalised reflexes  and  are analysed as allophones of a single phoneme  at this stage. This also included older instances of  which derived from Proto-Germanic, and could stand before back vowels, as in ġeong  ("young"; from PGmc *jungaz) and ġeoc  ("yoke"; from PGmc *juką). (See also Old English phonology: dorsal consonants.)
 * ċēosan ("to choose") vs. curon  ("chose", plural form)
 * ġēotan ("to pour") vs. guton  ("poured", plural form)

Standard Old English spelling did not reflect the split, and used the same letter for both  and, and  for both   and. In the standard modernised orthography (as used here), the velar and palatal variants are distinguished with a diacritic: stands for,  for ,  for  and , and  for  and. The geminates of these are written, , ,.

Loanwords from Old Norse typically do not display any palatalisation, showing that at the time they were borrowed the palatal–velar distinction was no longer allophonic and the two sets were now separate phonemes. Compare, for example, the modern doublet shirt and skirt; these both derive from the same Germanic root, but shirt underwent Old English palatalisation, whereas skirt comes from a Norse borrowing which did not. Similarly, give, an unpalatalised Norse borrowing, existed alongside (and eventually displaced) the regularly palatalised yive. Other later loanwords similarly escaped palatalisation: compare ship (from palatalised Old English sċip) with skipper (borrowed from unpalatalised Dutch schipper).

Palatal diphthongization
The front vowels e, ē, æ, and ǣ usually become the diphthongs ie, īe, ea, and ēa after ċ, ġ, and sċ:
 * sċieran "to cut", sċear "cut (past sing.)", sċēaron "cut (past pl.)", which belongs to the same conjugation class (IV) as beran "to carry", bær "carried (sing.)", bǣron "carried (pl.)"
 * ġiefan "to give", ġeaf "gave (sing.)", ġēafon "gave (pl.)", ġiefen "given", which belongs to the same conjugation class (V) as tredan "to tread", træd "trod (sing.)", trǣdon "trod (pl.)", treden "trodden"

In a similar way, the back vowels u, o, and a were spelled as eo and ea after ċ, ġ, and sċ:
 * ġung > ġeong "young" (cf. German jung)
 * sċolde > sċeolde "should" (cf. German sollte)
 * sċadu > sċeadu "shadow" (cf. Dutch schaduw)

Most likely, the second process was simply a spelling convention, and a, o, u actually did not change in pronunciation: the vowel u continued to be pronounced in ġeong, o in sċeolde, and a in sċeadu. This is suggested by their developments in Middle and Modern English. If ġeong and sċeolde had the diphthong eo, they would develop into Modern English *yeng and *sheeld instead of young and should.

There is less agreement about the first process. The traditional view is that e, ē, æ, and ǣ actually became diphthongs, but a minority view is that they remained as monophthongs: The main arguments in favour of this view are the fact that the corresponding process involving back vowels is indeed purely orthographic, and that diphthongizations like →  and  →  (if this, contrary to the traditional view, is the correct interpretation of orthographic ie) are phonetically unmotivated in the context of a preceding palatal or postalveolar consonant. In addition, both some advocates of the traditional view of ie and some advocates of the interpretation believe that the i in ie after palatal consonants never expressed a separate sound. Thus, it has been argued that the pronunciation only applied to the instances of ie expressing the sound resulting from i-mutation. In any case, it is thought plausible that the two merged as [iə̆] at a fairly early stage.
 * sċieran
 * sċear
 * sċēaron
 * ġiefan
 * ġeaf
 * ġēafon
 * ġiefen

Second fronting
Second fronting fronted to, and  to , later than related processes of a-fronting and a-restoration. Second fronting counterfed palatalization. Second fronting did not affect the standard West Saxon dialect of Old English. In fact, it took place only in a relatively small section of the area (English Midlands) where the Mercian dialect was spoken. Mercian itself was a subdialect of the Anglian dialect (which includes all of Central and Northern England).

Metathesis of r
Original sequences of an r followed by a short vowel metathesized, with the vowel and r switching places. This normally only occurred when the next following consonant was s or n, and sometimes d. The r could be initial or follow another consonant, but not a vowel.
 * Before s: berstan "to burst" (Icelandic bresta), gærs "grass" (Gothic gras), þerscan "to thresh" (Gothic þriskan)
 * Before n: byrnan ~ beornan "to burn (intr.)" (Gothic brinnan), irnan "to run" (Gothic rinnan), īren "iron" (< *īsren < īsern; Gothic eisarn), wærna "wren" (Icelandic rindill), ærn "house" (Gothic razn)
 * Before d: þirda "third" (Gothic þridja), Northumbrian bird "chick, nestling" (standard bryd)

Not all potential words to which metathesis can apply are actually affected, and many of the above words also appear in their unmetathesized form (e.g. græs "grass", rinnan "to run", wrenna "wren", rare forms brustæn "burst (past part.)", þrescenne "to thresh", onbran "set fire to (past)", īsern "iron", ren- "house", þridda "third"; briddes "birds" in Chaucer). Many of the words have come down to Modern English in their unmetathesized forms.

Metathesis in the other direction occasionally occurs before ht, e.g. wrohte "worked" (cf. obsolescent wrought; Gothic wurhta), Northumbrian breht ~ bryht "bright" (Gothic baírhts), fryhto "fright" (Gothic faúrhtei), wryhta "maker" (cf. wright; Old Saxon wurhtio). Unmetathesized forms of all of these words also occur in Old English. The phenomenon occurred in most Germanic languages.

I-mutation (i-umlaut)
Like most other Germanic languages, Old English underwent a process known as i-mutation or i-umlaut. This involved the fronting or raising of vowels under the influence of or  in the following syllable. Among its effects were the new front rounded vowels, and likely the diphthong (see above). The original following or  that triggered the umlaut was often lost at a later stage. The umlaut is responsible for such modern English forms as men, feet, mice (compare the singulars man, foot, mouse), elder, eldest (compare old), fill (compare full), length (compare long), etc.

For details of the changes, see Germanic umlaut, and particularly the section on i-mutation in Old English.

Double umlaut
In sequences of V...u...i; V...urj; V...uCʲCʲ; a phenomenon known as double umlaut occurred which caused the first two vowels to underwent i-umlaut.

Medial syncopation
In medial syllables, short low and mid vowels are deleted in all open syllables.

Short high vowels are deleted in open syllables following a long syllable, but usually remain following a short syllable; this is part of the process of high vowel loss.

Syncopation of low/mid vowels occurred after i-mutation and before high vowel loss. An example demonstrating that it occurred after i-mutation is mæġden "maiden": If the syncopation of short low/mid vowels had occurred before i-mutation, the result in Old English would be **meġden.

An example showing that syncopation occurred before high vowel loss is sāw(o)l "soul": Had it occurred after high vowel loss, the result in Old English would be **sāwlu.
 * PG *saiwalō > *sāwalu > *sāwlu (medial syncopation) > sāwl "soul". (By-form sāwol is due to vowel epenthesis.)

High vowel loss
In an unstressed open syllable, and  (including final  from earlier ) were lost when following a long syllable (i.e. one with a long vowel or diphthong, or followed by two consonants), but not when following a short syllable (i.e. one with a short vowel followed by a single consonant). This took place in two types of contexts:
 * 1) Absolutely word-final
 * 2) In a medial open syllable


 * Word-final

High-vowel loss caused many paradigms to split depending on the length of the root syllable, with -u or -e (from *-i) appearing after short but not long syllables. For example, This loss affected the plural of root nouns, e.g. PrePG * > PG fōtiz > fø̄ti > OE fēt "feet (nom.)". All such nouns had long-syllable stems, and so all were without ending in the plural, with the plural marked only by i-mutation.
 * feminine ō-stem nouns in the nom. sg.: PG gebō > OE ġiefu "gift" but PG laizō > OE lār "teaching";
 * neuter a-stem nouns in the nom./acc. pl.: PG skipō > OE scipu "ships" but PG wurdō > OE word "words";
 * masculine i-stem nouns in the nom./acc. sg.: PG winiz > OE wine "friend" but PG gastiz > OE ġiest "guest";
 * u-stem nouns in the nom./acc. sg.: PG sunuz > OE sunu "son" but PG handuz > OE hand "hand";
 * strong adjectives in the feminine nom. sg. and neuter nom./acc. pl.: PG tilō > OE tilu "good (fem. nom. sg., neut. nom./acc. pl.)" but PG gōdō > OE gōd "good (fem. nom. sg., neut. nom./acc. pl.)";
 * weak class 1 imperatives: OE freme "perform!" vs. hīer "hear!" (PG stems *frami- and *hauzi-, respectively; it's unclear if the imperatives ended in *-i or *-ī).

Two-syllable nouns consisting of two short syllables were treated as if they had a single long syllable — a type of equivalence found elsewhere in the early Germanic languages, e.g. in the handling of Sievers' law in Proto-Norse, as well as in the metric rules of Germanic alliterative poetry. Hence, final high vowels are dropped. However, in a two-syllable noun consisting of a long first syllable, the length of the second syllable determines whether the high vowel is dropped. Examples (all are neuter nouns):
 * Short-short: werod "troop", pl. werod (treated as equivalent to a single long syllable, or more correctly as a single long foot)
 * Short-long: færeld "journey", pl. færeld
 * Long-short: hēafod "head", pl. hēafdu (from *hēafodu)
 * Long-long: īsern "iron", pl. īsern

Note also the following apparent exceptions: In reality, these aren't exceptions because at the time of high-vowel loss the words had the same two-syllable long-short root structure as hēafod (see above).
 * OE wītu "punishments" (pl. of wīte) < PG wītijō;
 * OE rīċ(i)u "kingdoms" (pl. of rīċe) < PG rīkijō;
 * OE wildu "wild" (fem. of wilde) < PG wildijō;
 * OE strengþu "strength" < PG strangiþō.

As a result, high-vowel loss must have occurred after i-mutation but before the loss of internal -(i)j-, which occurred shortly after i-mutation.


 * Word-medial

Paradigm split also occurred medially as a result of high-vowel loss, e.g. in the past tense forms of Class I weak forms:
 * PG *dōmidē > OE dēmde "(he) judged"
 * PG *framidē > OE fremede "(he) did, performed (a duty)"

Normally, syncopation (i.e. vowel loss) does not occur in closed syllables, e.g. Englisċe "English", ǣresta "earliest", sċēawunge "a showing, inspection" (each word with an inflected ending following it). However, syncopation passes its usual limits in certain West Saxon verbal and adjectival forms, e.g. the present tense of strong verbs (birst "(you) carry" < PG *beris-tu, birþ "(he) carries" < PG *beriþ, similarly dēmst, dēmþ "(you) judge, (he) judges") and comparative adjectives (ġinġsta "youngest" < PG *jungistô, similarly strenġsta "strongest", lǣsta "least" < *lǣsesta < PG *laisistô).

When both medial and final high-vowel loss can operate in a single word, medial but not final loss occurs: This implies that final high-vowel loss must precede medial high-vowel loss; else the result would be **strengþ, hēafd.
 * PG *strangiþō > WG *strangiþu > *strengþu "strength";
 * PG *haubudō > WG *haubudu > *hēafdu "heads".

Loss of -(i)j-
Internal -j- and its Sievers' law variant -ij-, when they still remained in an internal syllable, were lost just after high-vowel loss, but only after a long syllable. Hence:
 * PG wītijō > WG wītiju > OE wītu "punishments" (if -ij- were lost before high-vowel loss, the result would be **wīt);
 * PG dōmijaną > *dø̄mijan (after i-mutation) > OE dēman "to judge" (cf. NE deem);
 * PG satjaną > WG sattjaną > *sættjaną (after Anglo-Frisian brightening) > *settjan (after i-mutation) > OE settan "to set".

Note that in Proto-Germanic, the non-Sievers'-law variant -j- occurred only after short syllables, but due to West Germanic gemination, a consonant directly preceding the -j- was doubled, creating a long syllable. West Germanic gemination didn't apply to, leaving a short syllable, and hence wasn't lost in such circumstances:
 * PG arjaną > OE erian "to plow".

By Sievers' law, the variant occurred only after long syllables, and thus was always lost when it was still word-internal at this point.

When -j- and -ij- became word-final after loss of a following vowel or vowel+/z/, they were converted into -i and -ī, respectively. The former was affected by high-vowel loss, surfacing as -e when not deleted (i.e. after ), while the latter always surfaces as -e:
 * PG kunją > WG kunnją > *kunni > *kynni > OE cynn "kin, family, kind";
 * PG harjaz > WG harja (West Germanic gemination didn't apply to /r/) > *hari > *heri > OE here "army";
 * PG wītiją > *wītī > OE wīte "punishment".

It is possible that loss of medial -j- occurred slightly earlier than loss of -ij-, and in particular before high-vowel loss. This appears to be necessary to explain short -jō stem words like nytt "use": If high-vowel deletion occurred first, the result would presumably be an unattested **nytte.
 * PG nutjō > WG nuttju > *nyttju (by i-mutation) > *nyttu (by j-loss) > OE nytt (by high-vowel deletion).

A similar loss of -(i)j- occurred in the other West Germanic languages, although after the earliest records of those languages (especially Old Saxon, which still has written settian, hēliand corresponding to Old English settan "to set", hǣlend "savior"). Some details are different, as the form kunni with retained -i is found in Old Saxon, Old Dutch and Old High German (but note Old Frisian kenn, kin).

This did not affect the new (< ) formed from palatalisation of PG, suggesting that it was still a palatal fricative at the time of the change. For example, PG wrōgijaną > early OE * > OE wrēġan.

Back mutation
Back mutation (sometimes back umlaut, guttural umlaut, u-umlaut, or velar umlaut) is a change that took place in late prehistoric Old English and caused short e, i and sometimes a to break into a diphthong (eo, io, ea respectively, similar to breaking) when a back vowel (u, o, ō, a) occurred in the following syllable. Examples:
 * seofon "seven" < *sebun (cf. Gothic sibun)
 * heol(o)stor "hiding place, cover" (cf. English holster) < earlier helustr < *hulestr < *hulistran (cf. Gothic hulistr)
 * eofor "boar" < *eburaz (cf. Old High German ebur)
 * heorot "hart" < *herutaz (cf. Old High German hiruz)
 * mioluc, meoluc "milk" < *melukz (cf. Gothic miluks)
 * liofast, leofast "you (sg.) live" < *libast
 * ealu "ale" < *aluþ

Note that io turned into eo in Early West Saxon and late Anglian.

A number of restrictions governed whether back mutation took place:
 * Generally it only took place when a single consonant followed the vowel being broken.
 * In the standard West Saxon dialect, back mutation only took place before labials (f, b, w) and liquids (l, r). In the Anglian dialect, it took place before all consonants except c, g (Anglian meodu "mead", eosol "donkey" vs. West Saxon medu, esol). In the Kentish dialect, it took place before all consonants (Kentish breogo "price" vs. West Saxon, Anglian bregu, brego).
 * Back mutation of a normally took place only in the Mercian subdialect of the Anglian dialect. Standard ealu "ale" is a borrowing from Mercian. Similar borrowings are poetic beadu "battle" and eafora "son, heir", cf. Gothic afar (many poetic words were borrowed from Mercian). On the other hand, standard bealu "evil" (arch. bale) and bearu "grove" owe their ea due to breaking — their forms at the time of breaking were *balwą, *barwaz, and the genitive singulars in Old English are bealwes, bearwes.

Anglian smoothing
In the Anglian (i.e. Mercian and Northumbrian) dialects of Old English, a process called smoothing undid many of the effects of breaking. In particular, before a velar or before an  or  followed by a velar, diphthongs were reduced to monophthongs. Note that the context for smoothing is similar to the context for the earlier process of breaking that produced many of the diphthongs in the first place. In particular: This change preceded h-loss and vowel assimilation.
 * ea > æ before a velar, e before or  + velar
 * ēa > ē
 * eo > e
 * ēo > ē
 * io > i
 * īo > ī

The diphthongs ie and īe did not exist in Anglian (or in fact in any dialect other than West Saxon).

H-loss
In the same contexts where the voiceless fricatives become voiced, i.e. between vowels and between a voiced consonant and a vowel,  is lost, with compensatory lengthening of the preceding vowel if it is short. This occurs after breaking; hence breaking before and  takes place regardless of whether the  is lost by this rule. An unstressed short vowel is absorbed into the preceding long vowel.

Examples:
 * sċōs "shoe" (gen.) < <, cf. sċōh (nom.)
 * fēos "money" (gen.) < <  <, cf. feoh (nom.)
 * wēalas "foreigners, Welsh people" < <, cf. wealh (sing.)

Vowel assimilation
Two vowels that occurred in hiatus (i.e. next to each other, with no consonant separating) collapsed into a single long vowel. Many occurrences were due to h-loss, but some came from other sources, e.g. loss of or  after a front vowel. (Loss of occurred early, in Proto-Germanic times. Loss of  occurred later, after i-umlaut.) If the first vowel was e or i (long or short), and the second vowel was a back vowel, a diphthong resulted. Examples:
 * sċōs "shoe" (gen.) < Proto-Germanic *skōhas (see under h-loss)
 * fēos "money" (gen.) < Proto-Germanic *fehas (see under h-loss)
 * frēond "friend" < frīond < Proto-Germanic *frijōndz (two syllables, cf. Gothic frijōnds)
 * sǣm "sea" (dat. pl.) < sǣum < *sǣwum < *sǣwimiz < Proto-Germanic *saiwimiz

Palatal umlaut
Palatal umlaut is a process whereby short e, eo, io appear as i (occasionally ie) before final ht, hs, hþ. Examples:
 * riht "right" (cf. German recht)
 * cniht "boy" (mod. knight) (cf. German Knecht)
 * siex "six" (cf. German sechs)
 * briht, bryht "bright" (cf. non-metathesized Old English forms beorht, (Anglian) berht, Dutch brecht)
 * hlihþ "(he) laughs" < *hlehþ < *hlæhiþ + i-mutation < Proto-Germanic *hlahiþ (cf. hliehhan "to laugh" < Proto-Germanic *hlahjaną)

Unstressed vowel reduction
There was steady vowel reduction in unstressed syllables, in a number of stages:
 * 1) In West Germanic times, absolutely final non-nasal *-ō (but not e.g. *-ōz, *-ô or *-ǭ) was raised and shortened to -u.
 * 2) All other final-syllable *ō were lowered to *ā. By Anglo-Frisian brightening, these ended up as *-ǣ (later -æ). Overlong *ô, as well as *ō in medial syllables, were unaffected.
 * 3) Although vowel nasality persisted at least up through Anglo-Frisian times and likely through the time of a-restoration, it was eventually lost (in stressed as well as unstressed syllables), with non-nasal vowels the result.
 * 4) Medial syncopation deleted word-medial short unstressed low/mid vowels in open syllables.
 * 5) High-vowel loss deleted short unstressed high vowels and  in open syllables following a long syllable, whether word-final or word-medial.
 * 6) All unstressed long and overlong vowels were shortened, with remaining long ō, ô shortening to a.
 * 7) This produced five final-syllable short vowels, which remained into early documented Old English (back a, u; front æ, e, i). By the time of the majority of Old English documents, however, all three front short vowels had merged into e.
 * 8) Absolutely final -u tends to be written u (sometimes o); but before a consonant, it is normally written o (e.g. seovon "seven" < PG *sibun). Exceptions are the endings -ung, -(s)um, -uc and when the root has u in it, e.g. duguþ "band of warriors; prosperity".
 * 9) Final-syllable e is written i in the endings -ing, -iġ, -(l)iċ, -isċ, -iht.

A table showing these developments in more detail is found in Proto-Germanic: Later developments.

Vowel lengthening
In the late 8th or early 9th century, short stressed vowels were lengthened before certain groups of consonants: ld, mb, nd, ng, rd, rl, rn, rs+vowel. Some of the lengthened vowels would be shortened again by or during the Middle English period; this applied particularly before the clusters beginning r. Examples of words in which the effect of lengthening has been preserved are:
 * ċild > ċīld > mod. child (but lengthening did not occur if another consonant immediately followed, as in ċildru, giving modern children with )
 * ald > āld > mod. old (but lengthening did not occur in the antepenultimate syllable, as in aldormann, giving modern alderman, with an originally short a)
 * climban > clīmban > mod. climb
 * grund > grūnd > mod. ground
 * lang > lāng > mod. long (ā went regularly to ō but was shortened in this position in late Middle English; compare Scots lang where the shortening occurred first)