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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 /t/ or a /d/ 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

See also

• Flapper (disambiguation)

• Disambiguation pages