Lissajous figure, alternate, alternation, back-and-forth, back and fill, balance, battledore and shuttlecock, change, come and go, coming and going, cower, dither, dodder, ebb and flow, equivocate, falter, flounder, fluctuate, flux and reflux, go through phases, halt, hitch and hike, limp, lurch, metronome, oscillate, oscillator, pass and repass, pendulate, pendulum, quiver, reciprocate, reciprocation, rhythmic play, ride and tie, ring the changes, rock, rocker, rocking chair, rocking stone, seesaw, seesawing, shake, shift, shilly-shally, shuffle, shuttle, shuttlecock, sine wave, stagger, stammer, stumble, sway, swing, teeter-totter, teeter-tottering, teeterboard, teetering, teetery-bender, tergiversate, to-and-fro, topple, totter, tottering, tremble, turn, ups and downs, vacillate, vary, vibrator, waver, wax and wane, weave, wibble-wabble, wigwag, wobble, zigzag