1. (v. i.) To move backward and forward; to vibrate; to swing; to sway; as, an oscillating fan\.

2. (v. i.) To vary or fluctuate between fixed limits; to act or move in a fickle or fluctuating manner; to change repeatedly, back and forth.

alternate back and fill be here again bob bobble careen change circle coggle come again come and go come around come round come round again come up again cycle dangle dither ebb and flow equivocate flounder fluctuate flutter go through phases hem and haw intermit librate lurch nutate pendulate pitch pulsate pulse reappear recur reel reoccur repeat resonate return revolve ring the changes rock roll roll around rotate seesaw shake shift shilly-shally shuffle stagger swag sway swing teeter teeter-totter tergiversate toss totter turn undulate vacillate vary vibrate wag waggle wave waver wax and wane wheel wheel around wobble