flap

(noun) any broad thin and limber covering attached at one edge; hangs loose or projects freely. Example: "He wrote on the flap of the envelope."

(noun) an excited state of agitation. Synonyms: dither, pother, fuss, tizzy. Examples: "He was in a dither." "There was a terrible flap about the theft."

(noun) the motion made by flapping up and down. Synonyms: flapping, flutter, fluttering.

(noun) a movable piece of tissue partly connected to the body.

(noun) a movable airfoil that is part of an aircraft wing; used to increase lift or drag. Synonyms: flaps.

(verb) move in a wavy pattern or with a rising and falling motion. Synonyms: roll, undulate, wave. Examples: "The curtains undulated." "The waves rolled towards the beach."

(verb) move noisily. Example: "Flags flapped in the strong wind."

(verb) move with a thrashing motion. Synonyms: beat. Examples: "The bird flapped its wings." "The eagle beat its wings and soared high into the sky."

(verb) move with a flapping motion. Synonyms: beat. Example: "The bird's wings were flapping."

(verb) make a fuss; be agitated. Synonyms: dither, pother.

(verb) pronounce with a flap, of alveolar sounds.