Ankle breaker

Ankle breakers are small but deep holes drilled into drawbridges, stone bridges, and other defensive fortifications, in order to allow a slow moving party to cross easily, while causing a running person to twist their ankle and fall, which could result in injury. Its purpose was to slow down or harm those attempting the enter the fortress.

In sports
In sports, ankle breakers are a combination of legal moves within the confines of a sports rules that send a player on the ground, hence the name 'ankle breaker'. The ankle breaker occurs most notably in football or basketball, with a crossover or other ball handling move, or in hockey.