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English definition of “flap”

flap

verb [I or T] (WAVE)    /flæp/ (-pp-)
to wave something, especially wings when or as if flying : A small bird flapped its wings furiously and flew off. Flags flapped in the breeze above their tents .Shaking, swinging and vibrating
(Definition of flap verb (WAVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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