n the act of moving back and forth
n abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
n a disorderly outburst or tumult
n the motion made by flapping up and down
v move along rapidly and lightly; skim or dart
v move back and forth very rapidly
v flap the wings rapidly or fly with flapping movements
v beat rapidly
v wink briefly
v. 飘动( flutter的第三人称单数 ); （心）快速跳动; 振翼, 拍翅膀