flap

US /flæp/

UK /flæp/

B2
n. (u.)Uncountable NounMotion or sound of something waving back and forth
I can hear the flap of the flag as it flies in the air
v.t./i.Verb (Transitive/Intransitive)To move something back and forth or up and down
If you flap the rug outside it will knock out the dirt
n.NounFlat material attached on one side
The tent was very tall and made of animal skin with a large flap for the door

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