what does flutter mean
flutter. 1  to wave, flap, or toss about: Banners fluttered in the breeze. 2  to flap the wings rapidly; fly with flapping movements. 3  to move in quick, irregular motions; vibrate. 4  to beat rapidly, as the heart. 5  to be tremulous or agitated. 6  to go with irregular motions or aimless course: to flutter back and forth. 7  to cause to flutter; vibrate; agitate.