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.
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 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
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The main difference between a flap and a stop consonant is that in a flap, there is no buildup of air pressure behind the place of articulation, and consequently no release burst.
The symbol for the alveolar lateral flap is the basis for the expected (though not officially recognized) symbol for the retroflex lateral flap,
They include a bilabial flap in Banda, which may be an allophone of the labiodental flap, and a velar lateral flap as an allophone in Kanite and Melpa.