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src: wikipedia
- Definition
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- flap :any broad thin and limber covering attached at one edge; hangs loose or projects freely
- he wrote on the flap of the envelope
- flap :move in a wavy pattern or with a rising and falling motion
- The curtains undulated|the waves rolled towards the beach
- flap :an excited state of agitation
- he was in a dither|there was a terrible flap about the theft
- flap :move noisily
- flags flapped in the strong wind
- flap :move with a thrashing motion
- The bird flapped its wings|The eagle beat its wings and soared high into the sky
- flap :move with a flapping motion
- The bird's wings were flapping
- flap :the motion made by flapping up and down
- flap :a movable piece of tissue partly connected to the body