FLAP definition in American English | Collins English Dictionary
https://www.collinsdictionary.com/us/dictionary/english/flap
WebNov 22, 2023 · If something such as a piece of cloth or paper flaps or if you flap it, it moves quickly up and down or from side to side. Gray sheets flapped on the clothes line. Synonyms: flutter, wave, swing, swish More Synonyms of flap. 2. transitive verb/intransitive verb.
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