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Definition of flutter : 1. Hurry; tumult; agitation of the mind; confusion; disorder.
2. The act of fluttering; quick and irregular motion; vibration; as, the flutter of a fan.
3. To drive in disorder; to throw into confusion.
4. To vibrate or move quickly; as, a bird flutters its wings.

Synonyms:

mental disturbance, shudder, jolt, jounce, dash, lick, disturbance, thrill, flash, flit, break, hesitate, scud, interference, noise, drub, vacillate, flapping, spark, whirl, sail, joggle, mental disorder, calm, turmoil, fray, upset, quake, ripple, hesitation, shake, falter, flaps, kerfuffle, thrash, flap, flick, fluctuate, commotion, pass off, fuss, fly, flop, brandish, agitation, wing, tizzy, pother, blow over, stew, shiver, oscillate, tumult, scoot, agitate, interruption, totter, repetition, folie, ruction, fluster, flitter, pass, quaver, faltering, swing, fade, gap, palpitate, weave, waffle, dither, ruckus, affray, evanesce, sway, shoot, dislocation, disruption, beat, rumpus, jar, psychological disorder, vibrate, fluttering, hoo-hah, fleet, cream, dart, ruffle, perturbation, bat, lather, din, pulsate, stir, reel, hover, hoo-ha, rock, hurly-burly, clobber, waggle, to-do, move

flicker (part of speech: verb)

glint, flicker, wave, shimmer, twinkle, sparkle, glimmer, tremble, quiver, blink, waver

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