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flap (n.)

mid-14c., flappe "a blow, slap, buffet," probably imitative of the sound of striking. Sense of "device for slapping or striking" is from early 15c. Meaning "something that hangs down" is first recorded 1520s, probably from flap (v.). Sense of "motion or noise like a bird's wing" is 1774; meaning "disturbance, noisy tumult" is 1916, British slang.

flap (v.)

early 14c., "dash about, shake, beat (the wings);" later "strike, hit" (mid-14c.); probably ultimately imitative. Meaning "to swing about loosely" is from 1520s. Related: Flapped; flapping.

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Definitions of flap from WordNet
1
flap (v.)
move in a wavy pattern or with a rising and falling motion;
Synonyms: roll / undulate / wave
flap (v.)
move noisily;
flags flapped in the strong wind
flap (v.)
move with a thrashing motion;
The bird flapped its wings
Synonyms: beat
flap (v.)
move with a flapping motion;
The bird's wings were flapping
Synonyms: beat
flap (v.)
make a fuss; be agitated;
Synonyms: dither / pother
flap (v.)
pronounce with a flap, of alveolar sounds;
2
flap (n.)
any broad thin and limber covering attached at one edge; hangs loose or projects freely;
he wrote on the flap of the envelope
flap (n.)
an excited state of agitation;
there was a terrible flap about the theft
Synonyms: dither / pother / fuss / tizzy
flap (n.)
the motion made by flapping up and down;
Synonyms: flapping / flutter / fluttering
flap (n.)
a movable piece of tissue partly connected to the body;
flap (n.)
a movable airfoil that is part of an aircraft wing; used to increase lift or drag;
Synonyms: flaps
From wordnet.princeton.edu