The act of fluttering, or multiple acts thereof; the back-and-forth motion of fluttering; a state of fluttering. • The collective flutter of many similar objects. • A flapping, crackling or rustling sound, as from a fluttering motion or any comparable sound; any series of quick repetitive sounds. • A sound that spreads in the manner of a wave or ripple. • The rapid up-and-down movement of the eyelids, and consequently eyelashes, often seen as intentionally flirtatious or alluring and often attributed to the eyes or eyebrows. • The movement a hand fan with a back-and-forth action using flicks of the wrist, so as to produce a graceful wave-like effect. • The leg motion of various strokes in swimming, especially the flutter kick. • The motion or state of falling while fluttering or falling as to produce fluttering. • A quick and irregular motion or vibration, or multiple such motions. • The trembling movement of an iris caused by a lack of support from the lens or as a complication of cataract surgery. • The vibration, shaking or flapping of fabric, such as in a kite, parachute or sail; the condition of having such a flutter. • The vibration of a bird's throat by rapidly pumping air into it with the mouth open in order to reduce excess body heat; gular flutter. • A method of articulation in playing wind instruments by curving the tongue at the sides and exhaling air over it to make it vibrate; flutter-tongue. • Any of several vocal effects, actions, techniques or conditions, notably tremolo, vibrato and trill, which are deliberately cultivated, as well as the neurological disorder vocal tremor or general strain. • An exception to, or fluctuation in, a pattern; a minor and temporary deviation from an expectation; a blip in a trend; a transient shift in allegiance. • A state or episode of agitation, of excited anxiety or anxious excitement, or of anticipation; an act of taking a flutter (To flutter for a short period of time) or of being all of a flutter. • A commotion, ruckus or disturbance; a brief state of energetic activity. • A spasmodic vibration of one or more body parts or the entire body; a shudder. • The condition or sensation of a rapid and abnormal heart rhythm; the action of a swift heartbeat. • A feeling of internal shifting, which may be caused by the movement of a fetus, muscular spasms associated with digestion (or indigestion) or other phenomena, including idiosyncratic perceptions. • A flash of emotion that accompanies an internal sensation, such as a rapid pulsation of the heart or a quiver of nervous disquiet; a small burst of emotion that may be felt or expressed; a fleeting feeling or idea experienced as a feeling. • The rapid horizontal movement (saccades) of the eyes without pausing between them; ocular flutter. • An abnormal rapid pulsation of the heart, caused by the too-rapid beating of the upper chambers; the condition of experiencing such a flutter. • The vibration of a heart valve; the condition of experiencing such vibrations. • A contraction of the diaphragm caused by synchronous diaphragmatic flutter. • A physical oscillation in a mechanical device; a state of oscillation; the action of oscillation. • An extremely dangerous divergent oscillation caused by a positive feedback loop between the elastic deformation of an object and the aerodynamic forces acting on it, potentially resulting in rapid structural failure. • The sound created when the throttle body in an engine is closed, forcing air through the turbocharger in the wrong direction, which makes the air bounce against the compressor blades, stalling them; the condition of having this occur in an engine. • The shaking of a vehicle or part of a vehicle, especially when caused by the engine surging, stalling or fluctuating in RPM. • A fluctuation in sound, especially a malfunction in technology. • A wavering quality in a voice, usually suggesting a specified feeling. • The sound of a camera shutter opening to let in light when taking a picture, or the sound of a camera app that simulates the same thing. • A sound distortion in film, as in an old movie, caused by variable film speed across the sound head. • The distortion in a cassette recording, especially the distortion caused by variations in the speed of the magnetic tape due to sticking and slipping during playback or recording. • The rapid variation of signal parameters, such as amplitude, phase, and frequency, caused by variations in the speed of the playback from a record player; the condition of having such variation. • The sound created by a flutter echo. • The pulsating sound created by the phase distortion caused by the simultaneous playback of two frequencies. • The sound distortion created by a turntable picking up subsonic interference. • The sound distortion created by vibrations in a speaker; speaker flutter. • A flicker or fluctuation in light; a type of visual distortion. • A malfunction in the image on a television, monitor or screen, which may be fluctuations in brightness, bands of distortion or a flickering or blurry quality; the condition of displaying such a malfunction. • A jumping or flickering effect in a film or a video, which may come from damage to the film or to defects in the recording, such as a shaky camera, or which may be a digital effect that simulates such conditions. • A speculative endeavor, especially a small one; an act of taking a flutter (To support a risky option.). • An attempt or try. • An act of foxhunting. • A small bet or risky investment, especially from a rookie gambler; an act of taking a flutter (To place a small bet.). • A hasty or casual game, e.g. of cards. • One or more objects or phenomena that flutter, that move as if fluttering, that appear to be fluttering or that cause fluttering; something fluttery. • A state of being amid or decorated in items that flutter. • A flurry of snow, smoke, dust, etc., or a light rain shower, or another phenomenon experientially similar to a light burst of rain or s