that flaps or flap

An instance where one flaps.

present participle of flap

plural of flapping

Anything broad and flexible that hangs loose, or that is attached by one side or end and is easily moved. / A hinged leaf.

(transitive) To move (something broad and loose) up and down. / (intransitive) To move loosely back and forth.

plural of flap

Third-person singular simple present indicative form of flap

simple past tense and past participle of flap

Fitted with a flap.