Definitions of flutter:
- noun: abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
- noun: the act of moving back and forth
- noun: the motion made by flapping up and down
- noun: a disorderly outburst or tumult
- verb: wink briefly
- verb: beat rapidly
- verb: move along rapidly and lightly; skim or dart
- verb: move back and forth very rapidly