Open English Wordnet
Nouns
(n)flapany broad thin and limber covering attached at one edge; hangs loose or projects freely“he wrote on the flap of the envelope” (n)dither, pother, fuss, tizzy, flapan excited state of agitation“he was in a dither”,
“there was a terrible flap about the theft” (n)flapa movable piece of tissue partly connected to the body (n)flap, flapsa movable airfoil that is part of an aircraft wing; used to increase lift or drag Verbs
(v)roll, undulate, flap, wavemove in a wavy pattern or with a rising and falling motion“The curtains undulated”,
“the waves rolled towards the beach” (v)flapto flutter noisily when moved by the wind“flags flapped in the strong wind” (v)beat, flapmove with a thrashing motion“The bird flapped its wings”,
“The eagle beat its wings and soared high into the sky” (v)beat, flapmove with a flapping motion“The bird's wings were flapping” (v)flappronounce with a flap, of alveolar sounds