| 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. |
| 8. | to throw into nervous or tremulous excitement; cause mental agitation; confuse. |
| 9. | a fluttering movement: He made little nervous flutters with his hands. |
| 10. | a state of nervous excitement or mental agitation: a flutter of anticipation. |
| 11. | flutter kick. |
| 12. | Audio. a variation in pitch resulting from rapid fluctuations in the speed of a recording. Compare wow 2 (def. 1). |
| 13. | Chiefly British. a small wager or speculative investment. |
flutter flut·ter (flŭt'ər)
n.
Abnormally rapid pulsation, especially of the atria or ventricles of the heart.