Synonyms and related words :
Lissajous figure, alternation, back-and-forth, chain of circumstances, chain reaction, chapter of accidents, coming and going, concatenation of events, ebb and flow, feast and famine, flux and reflux, ins and outs, reciprocation, rhythmic play, seesaw, seesawing, sine wave, teeter, teeter-totter, teeter-tottering, teetering, to-and-fro, tottering, vicious circle, vicissitudes, vicissitudes of fortune, wigwag