To flap or wave quickly but irregularly.
flags fluttering in the wind
Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.
Banks of gorgeous flowers were on every hand, and birds with rare and brilliant plumage sang and fluttered in the trees and bushes.
To undergo divergent oscillations (potentially to the point of causing structural failure) due to a positive feedback loop between elastic deformation and aerodynamic forces.
The act of fluttering; quick and irregular motion.
the flutter of a fan
A state of agitation.
flutter of spirits
From Middle English floteren, from Old English floterian, flotorian (“to float about, flutter”), from Proto-Germanic *flutrōną, frequentative of Proto-Germanic *flutōną (“to float”), equivalent to flo...
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An abnormal rapid pulsation of the heart.