flutter

(noun) the act of moving back and forth. Synonyms: waver, flicker.

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

(noun) a disorderly outburst or tumult. Synonyms: disturbance, disruption, commotion, hurly burly, to-do, hoo-ha, hoo-hah, kerfuffle. Examples: "They were amazed by the furious disturbance they had caused."

(noun) the motion made by flapping up and down. Synonyms: flap, flapping, fluttering.

(verb) move along rapidly and lightly; skim or dart. Synonyms: flit, fleet, dart. Examples: "The hummingbird flitted among the branches."

(verb) move back and forth very rapidly. Synonyms: flicker, waver, flitter, quiver. Examples: "The candle flickered."

(verb) flap the wings rapidly or fly with flapping movements. Examples: "The seagulls fluttered overhead."

(verb) beat rapidly. Synonyms: palpitate. Examples: "His heart palpitated."

(verb) wink briefly. Synonyms: bat. Examples: "Bat one's eyelids."