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Definition of flutter
verb [no object]
(of a bird or other winged creature) fly unsteadily or hover by flapping the wings quickly and lightly:a couple of butterflies fluttered around the garden [with object] (of a bird or other winged creature) flap (its wings) quickly and lightly:the lark fluttered its wings, hovering [with adverbial] move or fall with a light irregular or trembling motion:the remaining petals fluttered to the ground [with adverbial of direction] (of a person) move restlessly or uncertainly:the hostess fluttered forward to greet her guests (of a pulse or heartbeat) beat feebly or irregularly.
1an act of fluttering:there was a flutter of wings at the window a state or sensation of tremulous excitement:Sandra felt a flutter in the pit of her stomach her insides were in a flutter Aeronautics undesired oscillation in a part of an aircraft under stress. Medicine disturbance of the rhythm of the heart that is less severe than fibrillation:atrial flutter I was diagnosed as having a heart flutter Electronics rapid variation in the pitch or amplitude of a signal, especially of recorded sound. Compare with wow2. 2British informal a small bet:a flutter on the horses