Third-person singular simple present indicative form of flap.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "flaps" in a sentence
"Brown is only about five feet high, and he wears an overcoat ten times too big for him, and it flaps -- yes, it _flaps_ about his odious little heels."
"A great brown bear, just awake from his winter's sleep, hungry, his fur hanging to the bones in flaps of leanness, shoved his head within the lodge and said, "Oof!""
"* Chodin flaps his arms and lands on the telepone wire with the rest of the crows."