alternate, back and fill, bob, bobble, careen, change, chop and change, coggle, dangle, dither, ebb and flow, equivocate, flounder, flutter, go through phases, intermit, lack regularity, librate, lurch, nutate, oscillate, pendulate, pitch, recur, reel, resonate, return, reverse, ring the changes, rock, roll, seesaw, shake, shift, shilly-shally, shuffle, stagger, swag, sway, swing, teeter-totter, teeter, tergiversate, toss, totter, turn, vacillate, vary, vibrate, wag, waggle, wave, waver, wax and wane, wobble