Flap

Flap may refer to:

Arts, entertainment, and media

Flap (surgery), a surgical technique involving movement of vascularized tissue
- Free flap, a specific kind of surgical flap
5-lipoxygenase activating protein (FLAP)

Flap (aeronautics), a lift augmentation device on an airplane wing, often near the trailing edge
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 /t/ or a /d/ before an unstressed vowel is pronounced as a flap consonant
Flap, any hinged plate often used as a cover or a simple one-way valve
- 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
- Sluice or flap gate, a pressure driven water flow control device between a channel and other water body
Flapping, one of the basic mechanics of bird flight
Flapping, the up-and-down motion of a helicopter rotor
Hand flapping, a common form of self-stimulatory behaviour
Link flap, errant behavior in a communications link
Roof flap, an aerodynamic feature of race cars
Route flapping, when a network router flips between different routes