Flap

Flap may refer to:

* Flap (aircraft), a hinged surface on the trailing edge of an airplane wing
* Flapping, one of the basic mechanics of flight in birds
* Flap, any hinged plate often used as a cover or a simple one-way valve
** Cat flap, a hinged flap that allows a cat to enter or leave a room or building
** Butt flap, a separately removable part of underwear (un)covering the buttocks
** Sluice or flap gate, a pressure driven water flow control device between a channel and other water body
* Flap consonant, a sound produced by brief contact between the tongue and the roof of the mouth
** Intervocalic alveolar flapping, a process by which a /t/ phoneme] before an unstressed vowel is pronounced as a flap consonant
* Free flap, a surgical transfer of vascularised tissue
* Flap (Little Nemo), a minor character from "Little Nemo: Adventures in Slumberland"
* Route flapping, when a router alternately advertises a destination network first via one route then another
* Brouhaha, a general state of social agitation
* 5-lipoxygenase activating protein (FLAP)
* Flap (JumpStart 4th Grade), a purple vampire bat from

ee also

* Flapper, a woman who wore a certain style of clothes in the 1920s
* Flapping races, unlicensed horse rains in the UK and Ireland