This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To wave or flap rapidly in an irregular manner: curtains that fluttered in the breeze.

verb-intransitive. To fly by a quick light flapping of the wings.

verb-intransitive. To flap the wings without flying.

verb-intransitive. To move or fall in a manner suggestive of tremulous flight: "Her arms rose, fell, and fluttered with the rhythm of the song” ( Evelyn Waugh).

verb-intransitive. To vibrate or beat rapidly or erratically: My heart fluttered wildly.

verb-intransitive. To move quickly in a nervous, restless, or excited fashion; flit.

v. To cause to flutter: "fluttering her bristly black lashes as swiftly as butterflies' wings” ( Margaret Mitchell).

n. The act of fluttering.

n. A condition of nervous excitement or agitation: Everyone was in a flutter over the news that the director was resigning.

n. A commotion; a stir.

n. Pathology Abnormally rapid pulsation, especially of the atria or ventricles of the heart.

n. Rapid fluctuation in the pitch of a sound reproduction resulting from variations in the speed of the recording or reproducing equipment.

n. Chiefly British A small bet; a gamble: "If they like a flutter, Rick will get them better odds than the bookies” ( John le Carré).

v. To flap or wave quickly but irregularly.

v. Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.

v. To cause something to flap.

n. The act of fluttering.

n. A state of agitation.

n. An abnormal rapid pulsation of the heart.

n. A small bet or risky investment.

v. To vibrate or move quickly.

v. To drive in disorder; to throw into confusion.

n. The act of fluttering; quick and irregular motion; vibration.

n. Hurry; tumult; agitation of the mind; confusion; disorder.

To float; undulate; fluctuate.

To move up and down or to and fro in quick irregular motions; vibrate, throb, or move about rapidly or variably; hover or waver in quick motion.

To be in agitation; fluctuate in feeling; be in uncertainty; hang on the balance.

To be frivolous or foppish; play the part of a beau of the period; fly from one thing to another.

To move in quick irregular motions; agitate; vibrate: as, a bird fluttering its wings.

To cause to flutter; disorder; throw into confusion.

n. Quick and irregular motion, as of wings; rapid vibration, undulation, or pulsation: as, the flutter of a fan or of the heart.

n. Agitation; confusion; confused or excited feeling or action.

n. A flow of mingled water and steam from the gage-cocks of a steam-boiler. This occurs in locomotives when the boiler primes, or works water into the cylinders.

v. wink briefly

v. move along rapidly and lightly; skim or dart

n. the motion made by flapping up and down

n. the act of moving back and forth

v. flap the wings rapidly or fly with flapping movements

n. abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block

v. beat rapidly

v. move back and forth very rapidly

n. a disorderly outburst or tumult

"In these two wind-conscious memoirs, the word flutter appears often and imaginatively."

fluttered    fluttering    flutters   

blink    wink    nictate    nictitate    wave    undulation    motility    movement    motion    move   

flap   

flutter in the dovecote   

vibration    hurry    tumult    confusion    disorder    play    wave    agitate    confuse   

Nutter    Sutter    aflutter    butter    clutter    cutter    gutter    hutter    mutter    nutter   

flicker    tremor    stir    rustle    twitch    quiver    tingle    murmur    throb    gasp