to-and-fro movement

His eyes did not bother to follow the agitated and rapid to-and-fro movement of the other.

If a small group of people sets one tower in motion by a rhythmical to-and-fro movement, the other tower begins to swing too.

A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving to-and-fro movements of one or more body parts.

Vibration Vibration, a to-and-fro movement.

It was still swinging back and forth like a pendulum, but with a slight rotary motion, and its to-and-fro movement had not perceptibly abated.

Despite the to-and-fro movements of the inhabitants of the salt wastes, no traces of their footsteps marked the surface, blurred within a few minutes by the leaking water.

Referring to the song's square-dance theme, Leng suggests that folk dancing's cycle of about-turns and to-and-fro movement reminded Harrison of the Beatles' "seemingly endless, and pointless, legal orbits around one another".