Flap

n.	1.	Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment. A cartilaginous flap upon the opening of the larynx. - Sir T. Browne.
	2.	A hinged leaf, as of a table or shutter.
	3.	The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or of a wing.
	4.	(Far.) A disease in the lips of horses.
	5.	(Aeronautics) a movable part of an airplane wing, used to increase lift or drag, especially when taking off or landing. used often in the plural. Flap tile a tile with a bent up portion, to turn a corner or catch a drip. Flap valve (Mech.) a valve which opens and shuts upon one hinged side; a clack valve.
v. t.	1.	To beat with a flap; to strike. [imp. & p. p. Flapped ; p. pr. & vb. n. Flapping .] Yet let me flap this bug with gilded wings. - Pope.
	2.	To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat. To flap in the mouth to taunt. - W. Cartwright.
v. i.	1.	To move as do wings, or as something broad or loose; to fly with wings beating the air. The crows flapped over by twos and threes. - Lowell.
	2.	To fall and hang like a flap, as the brim of a hat, or other broad thing.

Noun	1.	flap - any broad thin and limber covering attached at one edge; hangs loose or projects freely; "he wrote on the flap of the envelope"
	2.	flap - an excited state of agitation; "he was in a dither"; "there was a terrible flap about the theft" Synonyms: dither, fuss, pother, tizzy
	3.	flap - the motion made by flapping up and down Synonyms: flapping, fluttering, flutter
	4.	flap - a movable piece of tissue partly connected to the body
	5.	flap - a movable airfoil that is part of an aircraft wing; used to increase lift or drag Synonyms: flaps
Verb	1.	flap - move in a wavy pattern or with a rising and falling motion; "The curtains undulated"; "the waves rolled towards the beach" Synonyms: undulate, wave, roll
	2.	flap - move noisily; "flags flapped in the strong wind"
	3.	flap - move with a thrashing motion; "The bird flapped its wings"; "The eagle beat its wings and soared high into the sky" Synonyms: beat
	4.	flap - move with a flapping motion; "The bird's wings were flapping" Synonyms: beat
	5.	flap - make a fuss; be agitated Synonyms: dither, pother
	6.	flap - pronounce with a flap, of alveolar sounds

1.		FLAP - A symbolic mathematics package for IBM 360. ["FLAP Programmer's Manual", A.H. Morris Jr., TR-2558 (1971) US Naval Weapons Lab]. [Sammet 1969, p. 506].
2.	(storage, jargon)	flap - To unload a DECtape (so it goes flap, flap, flap). Old-time hackers at MIT tell of the days when the disk was device 0 and microtapes were 1, 2, etc. and attempting to flap device 0 would instead start a motor banging inside a cabinet near the disk. The term is used, by extension, for unloading any magnetic tape. See also macrotape. Modern cartridge tapes no longer actually flap, but the usage has remained. The term could well be re-applied to DEC's TK50 cartridge tape drive, a spectacularly misengineered contraption which makes a loud flapping sound, almost like an old reel-type lawnmower, in one of its many tape-eating failure modes.
3.	(networking)	flap - See flapping router.

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