Flap

The word Flap can refer to several things.

In mechanics a flap is any hinged plate often used as a cover or a simple one-way valve.
A flap (aircraft) is a hinged surface on the trailing edge of an airplane wing.
A derisive slang term used to describe Air Force personnel, derived from the flap (aircraft).
A butt flap is a separately removable part of underwear (un)covering the buttocks
Flap, in (archaic) computer science jargon, refers to the process for unmounting a magnetic tape. When the system operator commanded a tape drive to unmount a tape, it would rewind the medium and then, as the tape unwrapped from the take-up reel, it would go "flap-flap-flap" as the feed reel spun down.
In slang a flap is an outer section of skin of the vulva. The plural 'flaps' is a common term used in Scotland to describe the labium after giving birth.
A cat flap is a hinged flap to allow a cat to enter and leave a room
In plastic surgery, a flap is a vascularised tissue transfer.
In phonetics and phonology, a flap consonant is a sound produced by brief contact between the tongue and the roof of the mouth.
In the phonology of English, flapping is a process by which a /t/ phoneme before an unstressed vowel is pronounced as a flap consonant.
Flapping can also refer to a repetitive up-and-down motion most commonly associated with a bird's wing in flight. Birds flap to provide airflow against their wing, thereby generating lift. Larger wings are more efficient (a side-effect of their aspect ratio) so smaller birds must flap much more quickly, while larger birds can soar without flapping for long periods.
In telecommunications, the term flapping is likely to be used to refer to route flapping
A wave of reports of sightings of objects or phenomena, such as UFOs.
In biochemistry FLAP is an acronym for 5-lipoxygenase activating protein.
Flappers were mondain woman from the 1920s.

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