to swing backward and forward like a pendulum
to move or travel back and forth between two points
to vary between opposing beliefs, feelings, courses of action, etc
in physics, to undergo or cause to undergo a regular change from maximum to minimum, esp in a flow of electricity periodically changing direction
in physics, to undergo oscillation
in physics, to cause (something) to undergo oscillation
oscillation noun
oscillator noun
oscillatory /-lət(ə)ri/ adj
[Latin oscillatus, past part. of oscillare to swing, from oscillum swing]