flap

Noun

• a movable airfoil that is part of an aircraft wing; used to increase lift or drag

• a movable piece of tissue partly connected to the body

• the motion made by flapping up and down

• an excited state of agitation
  • he was in a dither
    
  • there was a terrible flap about the theft
    

• any broad thin and limber covering attached at one edge; hangs loose or projects freely
  • he wrote on the flap of the envelope
    

Verb

• pronounce with a flap, of alveolar sounds

• make a fuss; be agitated

• move with a flapping motion
  • The bird's wings were flapping
    

• move with a thrashing motion
  • The bird flapped its wings
    
  • The eagle beat its wings and soared high into the sky
    

• move noisily
  • flags flapped in the strong wind
    

• move in a wavy pattern or with a rising and falling motion
  • The curtains undulated
    
  • the waves rolled towards the beach
    

Related words

• Synonyms: 
  flaps , flapping , flutter , fluttering , dither , pother , fuss , tizzy , beat , roll , undulate , wave