The term 'cause to move back and forth' can be described by three words: TEETER, ROCK, and WIGGLE. TEETER is a verb meaning to move unsteadily from side to side, as if about to fall. ROCK is a verb meaning to move or sway gently back and forth or from side to side. WIGGLE is a verb meaning to move or cause to move up and down or from side to side with quick jerky movements. Together, these three words describe the action of causing something to move back and forth.