flap

1 :  a stroke with something broad :  slap

2 obsolete :  something broad and flat used for striking

3 :  something that is broad, limber, or flat and usually thin and that hangs loose or projects freely: such asa :  a piece on a garment that hangs freeb :  a part of a book jacket that folds under the book's coverc :  a piece of tissue partly severed from its place of origin for use in surgical graftingd :  an extended part forming the closure (as of an envelope or carton)

4 :  the motion of something broad and limber (such as a sail or wing)

5 :  a movable auxiliary airfoil usually attached to an airplane wing's trailing edge to increase lift or drag — see airplane illustration

6a :  a state of excitement or agitation :  tizzy, uproarb :  something that generates an uproar

7 :  a consonant (such as the sound \d\ in ladder and \t\ in latter) characterized by a single rapid contact of the tongue or lower lip against another point in the mouth —called also tap