alternate, back and fill, battledore and shuttlecock, come and go, ebb and flow, flounder, fluctuate, go through phases, hitch and hike, oscillate, pass and repass, pendulate, reciprocate, ride and tie, ring the changes, seesaw, shift, shuffle, shuttle, shuttlecock, stagger, sway, swing, teeter, teeter-totter, to-and-fro, totter, turn, vacillate, vary, waver, wibble-wabble, wigwag, wobble, zigzag