Flap

Flap may refer to:

Arts, entertainment, and media

 * Flap (film), a 1970 American film
 * Flap, a boss character in the arcade game Gaiapolis
 * Flap, a minor character in the film Little Nemo: Adventures in Slumberland

Biology and healthcare

 * Flap (surgery), a surgical technique involving movement of vascularized tissue
 * Free flap, a specific kind of surgical flap
 * Flapping tremor is a medical condition, also called asterixis
 * 5-lipoxygenase activating protein (FLAP)

Computing and networks

 * The phenomenon of some variable or resource oscillating or alternating rapidly between two states
 * Route flapping, when a network router flips between different routes
 * Link flap, errant behavior in a communications link

Engineering and design

 * Flap (aeronautics), a lift augmentation device on an airplane wing, often near the trailing edge
 * Flapping, the up-and-down motion of a helicopter rotor
 * Flap, any hinged plate often used as a cover or a simple one-way valve
 * Sluice or flap gate, a pressure driven water flow control device between a channel and other water body
 * Bum flap (or butt flap), a separately removable part of underwear (un)covering the buttocks
 * Mudflap, a guard for tires
 * Pet door or pet flap
 * Roof flap, an aerodynamic feature of race cars

Linguistics

 * Flap consonant, a sound produced by brief contact between one articulator (such as the tongue) and another (such as the roof of the mouth)
 * Flapping, a process by which a or a  before an unstressed vowel is pronounced as a flap consonant

Other uses

 * Flapping, one of the basic mechanics of bird flight


 * Hand flapping, a common form of self-stimulatory behaviour