flutter

v., -tered, -ter·ing, -ters.

v.intr.

1. To wave or flap rapidly in an irregular manner: curtains that fluttered in the breeze.
2. 1. To fly by a quick light flapping of the wings.
   2. To flap the wings without flying.
3. 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).
4. To vibrate or beat rapidly or erratically: My heart fluttered wildly.
5. To move quickly in a nervous, restless, or excited fashion; flit.

v.tr.

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

n.

1. The act of fluttering.
2. A condition of nervous excitement or agitation: Everyone was in a flutter over the news that the director was resigning.
3. A commotion; a stir.
4. Pathology. Abnormally rapid pulsation, especially of the atria or ventricles of the heart.
5. Rapid fluctuation in the pitch of a sound reproduction resulting from variations in the speed of the recording or reproducing equipment.
6. Chiefly British. A small bet; a gamble: “If they like a flutter, Rick will get them better odds than the bookies” (John le Carré).

[Middle English floteren, from Old English floterian.]

flutterer flut'ter·er n.
fluttery flut'ter·y adj.

An aeroelastic self-excited vibration with a sustained or divergent amplitude, which occurs when a structure is placed in a flow of sufficiently high velocity. Flutter is an instability that can be extremely violent. At low speeds, in the presence of an airstream, the vibration modes of an aircraft are stable; that is, if the aircraft is disturbed, the ensuing motion will be damped. At higher speeds, the effect of the airstream is to couple two or more vibration modes such that the vibrating structure will extract energy from the airstream. The coupled vibration modes will remain stable as long as the extracted energy is dissipated by the internal damping or friction of the structure. However, a critical speed is reached when the extracted energy equals the amount of energy that the structure is capable of dissipating, and a neutrally stable vibration will persist. This is called the flutter speed. At a higher speed, the vibration amplitude will diverge, and a structural failure will result. See also Aeroelasticity.

Aircraft manufacturers now have engineering departments whose primary responsibility is fluffer safety. Modern flutter analyses involve extensive computations, requiring the use of large-capacity, high-speed digital computers. Flutter engineers contribute to the design by recommending stiffness levels for the structural components and control surface actuation systems and weight distributions on the lifting surfaces, so that the aircraft vibration characteristics will not lead to flutter within the design speeds and altitudes. See also Airframe; Wing.

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verb

1. To move or cause to move about while being fixed at one edge: flap, fly, wave. See repetition.
2. To move through the air with or as if with wings: flap, flit, flitter, fly, sail, wing. See move/halt.
3. To move quickly, lightly, and irregularly like a bird in flight: flicker, flit, flitter, hover. See repetition.
4. To move (one's arms or wings, for example) up and down: beat, flap, flitter, flop, waggle, wave. See repetition.

noun

A state of discomposure: agitation, dither, fluster, perturbation, tumult, turmoil, upset. Informal lather, stew. See calm/agitation.

n

A quick, irregular motion.

A more rapid than normal heart beat, but not so rapid or chaotic as with fibrillation.

A rapid vibration or pulsation.

• atrial f. — cardiac arrhythmia in which the atrial contractions are rapid (200–320 per minute), but regular.
• diaphragmatic f. — peculiar wavelike fibrillations of the diaphragm of unknown cause. See also synchronous diaphragmatic flutter.
• impure f. — atrial flutter in which the atrial rhythm is irregular.
• mediastinal f. — abnormal mobility of the mediastinum during respiration.
• pure f. — atrial flutter in which the atrial rhythm is regular.
• f. valve — in an intravenous infusion apparatus, a floating bead in the fluid chamber that allows air to enter the system but prevents fluid from escaping. Its movement is often viewed as an indicator of the speed of fluid infusion, but it is inaccurate.
• ventricular f. — a possible transition stage between ventricular tachycardia and ventricular fibrillation, the electrocardiogram showing rapid, uniform, and virtually regular oscillations, 250 or more per minute.

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Dansk (Danish)
v. intr. - baske med vingerne, skælve, sætte sindene i bevægelse
v. tr. - få til at flagre, vifte med, opskræmme
n. - rysten, flagren, opstandelse

Nederlands (Dutch)
fladderen, doen fladderen, trillen, dwarrelen, zenuwachtig rondlopen, onregelmatig slaan, opgewonden zijn, iemand zenuwachtig maken, opwinding, (spastische) trilling, gok, flakkering (beeldscherm), hoge geluidsverstoring

Français (French)
v. intr. - battre des ailes, palpiter, flotter, s'agiter, battre irrégulièrement (le pouls), battre faiblement (le pouls)
v. tr. - agiter, battre (des cils), troubler (qn) (fam)
n. - battement, flottement, voltigement, (Méd) palpitations cardiaques, surcroît d'excitation/de panique, (GB) (être) tout en émoi, (GB) petit pari (aux courses), spéculation (en Bourse), (Élec) diaphonie, (Aviat) oscillation (d'un avion)

Deutsch (German)
v. - flattern, sich unruhig bewegen
n. - Flattern, Aufregung, kleine Wette

Ελληνική (Greek)
v. - φτερουγίζω, φτεροκοπώ, πεταρίζω, τρέμω, ταράσσομαι, πλαταγίζω, χτυπώ, κυματίζω, ανεμίζω, κινούμαι νευρικά
n. - φτερούγισμα, φτεροκόπημα, ταραχή, αναστάτωση, εκνευρισμός, κυματισμός, ανέμισμα, τρεμούλιασμα, παραμόρφωση (ήχου)

Italiano (Italian)
svolazzare

Português (Portuguese)
v. - agitar (asas ou bandeira), mover-se de forma irrequieta
n. - alvoroço (m), palpitação (f), fezinha (f) (pequena aposta) (gír.)

Русский (Russian)
трепетать, взмахивать крыльями, волноваться, дергаться, трепетание, размахивание, трепет, риск на небольшую ставку, колебание

Español (Spanish)
v. intr. - revolotear, batir, ondear, ondular, palpitar
v. tr. - revolotear, batir, ondear, ondular, palpitar
n. - vibración, aleteo, agitación, confusión

Svenska (Swedish)
v. - fladdra, flaxa, fladdra (om hjärta o puls), darra av oro, fladdra med, jaga upp (bildl.)
n. - fladdrande, uppståndelse, spekulation (vard.)

中文（简体）(Chinese (Simplified))
摆动, 烦扰, 鼓翼, 拍, 使焦急

中文（繁體）(Chinese (Traditional))
v. intr. - 擺動, 煩擾, 鼓翼
v. tr. - 拍, 使焦急
n. - 擺動, 煩擾, 鼓翼

한국어 (Korean)
v. intr. - 펄럭이다, 떨다, 날개 치다, 동요하다
v. tr. - ~를 퍼덕거리다, 흥분 시키다, ~을 떨게 하다
n. - 펄럭임, 날개 침, 동요, 떨림, 흥분

日本語 (Japanese)
v. - 羽ばたく, ばたばたさせる, 羽ばたいて飛ぶ, ひらひらと落ちる, がぱたぱた翻る, そわそわと動き回る, どきどきする, 羽ばたきする
n. - 羽ばたき, 翻ること, 動揺, ときめき, 賭け, 再生むら

العربيه (Arabic)
‏(فعل) يرفرف , يرتعد (الاسم) رفرفه , اهتياج‏

עברית (Hebrew)
v. intr. - ‮ניפנף, התרוצץ, התנופף, רעד, פעם בחולשה, באופן לא-סדיר (לב), ריטטה (לשון)‬
v. tr. - ‮הביך, בלבל, טפח (בכנפיים)‬
n. - ‮נפנוף, התרגשות, תנודה, תקלה, רעד, הימור, שינוי מהיר בגובה הקול המוקלט, רטט‬

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