[1] : The Collaborative International Dictionary of English v.0.48

flap \flap\, v. t. imp.  p. p. flapped; p. pr.  vb. n.
   flapping. prob. of imitative origin; cf. d. flappen, e.
   flap, n., flop, flippant, fillip.
   1. to beat with a flap; to strike.
      1913 webster

            yet let me flap this bug with gilded wings. --pope.
      1913 webster

   2. to move, as something broad and flaplike; as, to flap the
      wings; to let fall, as the brim of a hat.
      1913 webster

   to flap in the mouth, to taunt. obs. --w. cartwright.
      1913 webster
see also:
flapped flapping to flap in the mouth 

Mouth >> M Words
Mouth, definition of term: Mouth
mouth_pag1.html

Flap >> F Words
Flap, definition of term: Flap
flap_pag1.html

Mouth Organ >> M Words
Mouth Organ, definition of term: Mouth Organ
mouth+organ_pag1.html

Dragons Mouth >> D Words
Dragons Mouth, definition of term: Dragons Mouth
dragons+mouth_pag1.html

Foot And Mouth >> F Words
Foot And Mouth, definition of term: Foot And Mouth
foot+and+mouth_pag1.html