Flap

The word Flap can refer to several things.

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• 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.
• 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 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
• 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
• A derisive slang term used to describe Air Force personnel. Term is derived from defintion 2, flap (aircraft).