flutter - noun

the act of moving back and forth

abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block

a disorderly outburst or tumult

the motion made by flapping up and down

flutter - verb

• move along rapidly and lightly; skim or dart
• move back and forth very rapidly
• flap the wings rapidly or fly with flapping movements
• beat rapidly
• wink briefly

flutter - thesaurus

bat   commotion   dart   disruption   disturbance   flap   flapping   fleet   flicker   flit   flitter   fluttering   kerfuffle   palpitate   quiver   waver