Definition of flutter (Entry 1 of 2) intransitive verb. 1 : to flap the wings rapidly butterflies fluttering among the flowers. 2a : to move with quick wavering or flapping motions a sail fluttering in the wind. b : to vibrate in irregular spasms his heart fluttered.28 Şub 2022
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to move in quick, irregular motions; vibrate . to beat rapidly, as the heart.
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