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English definition of “flap”

flap

verb [I/T] (WAVE)   /flæp/ (-pp-)
(of a bird’s wings) to wave up and down while flying, or (of objects that cannot fly) to move quickly from side to side or up and down: [T] A small bird flapped its wings. [I] Flags flapped in the breeze.
(Definition of flap verb (WAVE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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