Webster's English Dictionary

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flap

1. flap \'flap\ n [ME flappe] 1: a stroke with something broad : SLAP  obs  
   2: something broad and flat used for striking  3: something that is broad, 
   limber, or flat and usu. thin and that hangs lo ose or projects freely : as 
   3a: a piece on a garment that hangs free  3b: a piece of tissue partly 
   severed from its place of origin for use in su rgical grafting 3c: an 
   extended part forming the closure (as of an envelope)  3d: a movable 
   auxiliary airfoil usu. attached to an airplane wing's trailin g edge 4: the 
   motion of something broad and limber 
2. flap vb or flapped;  or flap.ping 1: to beat with or as if with a flap  
   2: to toss sharply : FLING  3: to move or cause to move in flaps  1: to 
   sway loosely usu. with a noise of striking and esp. when moved by wi nd 2a: 
   to beat or pulsate wings or something suggesting wings  2b: to progress by 
   flapping  3: to flutter ineffectively