flutter

to move in quick, irregular motions; vibrate.

to beat rapidly, as the heart.

to be tremulous or agitated.

to go with irregular motions or aimless course: to flutter back and forth.

flutter kick.

Audio. a variation in pitch resulting from rapid fluctuations in the speed of a recording.: Compare wow² (def. 1).

Chiefly British. a small wager or speculative investment.

(intr) to move, esp downwards, with an irregular motion

(intr) pathol (of the auricles of the heart) to beat abnormally rapidly, esp in a regular rhythm

to be or make nervous or restless

(intr) to move about restlessly

swimming to cause (the legs) to move up and down in a flutter kick or (of the legs) to move in this way

(tr) British informal to wager or gamble (a small amount of money)

excited interest; sensation; stir

British informal a modest bet or wager

pathol an abnormally rapid beating of the auricles of the heart (200 to 400 beats per minute), esp in a regular rhythm, sometimes resulting in heart block

electronics a slow variation in pitch in a sound-reproducing system, similar to wow but occurring at higher frequencies

a potentially dangerous oscillation of an aircraft, or part of an aircraft, caused by the interaction of aerodynamic forces, structural elastic reactions, and inertia

swimming See flutter kick

Also called: flutter tonguing music a method of sounding a wind instrument, esp the flute, with a rolling movement of the tongue