flutterer

vi.(of birds) to flap wings, to fly in a flapping manner; to hover; (of flags, etc.) to wave, to flutter; to fall lightly; to move about restlessly; to be anxious or agitated; to vibrate or move quickly and irregularly
vt.to flap (wings); to make flutter; to wave; to cause to flutter; to disturb; to agitate; to cause panic
n.the act of fluttering; agitation or excitement; (pathology) fluttering of the heart; flutter in aviation; a small gamble or speculation; flutter in radio frequency; flutter in television images; vibration of the tongue in wind instruments; flutter kick in swimming; change or distortion in recording speed