(v. i. & t.) To move up and down on the ends of a balanced plank, or the like, as children do for sport; to seesaw; to titter; to titter-totter.

Lissajous figure alternate alternation back and fill back-and-forth 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