Answer: fluttered

AnswerCrossword Clue
FLUTTEREDVibrated.
FLUTTEREDFlapped.
flutteredMove or fall with a light irregular or trembling motion
fluttered(of a pulse or heartbeat) Beat feebly or irregularly
flutteredFLUTTER, to move in quick motions
fluttered(of a bird or other winged creature) Fly unsteadily or hover by flapping the wings quickly and lightly
fluttered(of a person) Move restlessly or uncertainly
fluttered(with reference to a bird's wings) Flap in such a way