flap

flap (http://definr.com/flap)

     n 1: any broad thin and limber covering attached at one edge;
          hangs loose or projects freely; "he wrote on the flap of
          the envelope"
     2: an excited state of agitation; "he was in a dither"; "there
        was a terrible flap about the theft" [syn: dither, pother,
         fuss, tizzy]
     3: the motion made by flapping up and down [syn: flapping, flutter,
         fluttering]
     4: a movable piece of tissue partly connected to the body
     5: a movable airfoil that is part of an aircraft wing; used to
        increase lift or drag [syn: flaps]
     v 1: move in a wavy pattern, as of curtains [syn: undulate, wave]
     2: move noisily; "flags flapped in the strong wind"
     3: move with a thrashing motion; "The bird flapped its wings";
        "The eagle beat its wings and soared high into the sky"
        [syn: beat]
     4: move with a flapping motion; "The bird's wings were
        flapping" [syn: beat]
     5: make a fuss; be agitated [syn: dither, pother]
     6: pronounce with a flap, of alveolar sounds