flutter in WordNet English dictionary

1. wink briefly
   "bat one's eyelids"
   bat  flutter 
   
2. move along rapidly and lightly; skim or dart
   "The hummingbird flitted among the branches"
   flit  flutter  fleet  dart 
   
3. move back and forth very rapidly
   "the candle flickered"
   flicker  waver  flitter  flutter  quiver 
   
4. beat rapidly
   "His heart palpitated"
   palpitate  flutter 
   
5. flap the wings rapidly or fly with flapping movements
   "The seagulls fluttered overhead"
   flutter 
   

1. a disorderly outburst or tumult
   "they were amazed by the furious disturbance they had caused"
   disturbance  disruption  commotion  flutter  hurly burly  to-do  hoo-ha  hoo-hah  kerfuffle 
   
2. the motion made by flapping up and down
   flap  flapping  flutter  fluttering 
   
3. the act of moving back and forth
   waver  flutter  flicker 
   
4. abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
   flutter