flutter flutter /ˈflʌtɝ/

noun

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

verb

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