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