Answer: oscillating

AnswerCrossword Clue
oscillatingWaver between extremes of opinion, action, or quality
oscillatingMove or swing back and forth at a regular speed
oscillating(of a circuit or device) Cause the electric current or voltage running through it to behave in this way
oscillatingOSCILLATE, to swing to and fro like a pendulum
oscillatingVary in magnitude or position in a regular manner around a central point