- the act of fluttering
- a state of agitation
- an abnormal rapid pulsation of the heart
- a small bet
- (intransitive) To flap or wave quickly but irregularly; as, flags fluttering in the wind.
- (intransitive) Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.
- (transitive) To cause something to flutter.