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Flap

n.
  1. A hinged leaf, as of a table or shutter.
  2. The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or of a wing.
  3. (Aeronautics) a movable part of an airplane wing, used to increase lift or drag, especially when taking off or landing. used often in the plural.
    4. Flap tile ,
    a tile with a bent up portion, to turn a corner or catch a drip.
    Flap valve (Mech.),
    a valve which opens and shuts upon one hinged side; a clack valve.

v. t.
  1. To beat with a flap; to strike.
  2. To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat.
    3. To flap in the mouth ,
    to taunt.

v. i.
  1. To move as do wings, or as something broad or loose; to fly with wings beating the air.
  2. To fall and hang like a flap, as the brim of a hat, or other broad thing.