flutter

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; "they were amazed by the furious disturbance they had caused"

the motion made by flapping up and down

move along rapidly and lightly; skim or dart; "The hummingbird flitted among the branches"

move back and forth very rapidly; "the candle flickered"

flap the wings rapidly or fly with flapping movements; "The seagulls fluttered overhead"

beat rapidly; "His heart palpitated"

wink briefly; "bat one's eyelids"