seesaw

(noun) a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end. Synonyms: teeter, teeter-totter, teetertotter, teeterboard, tilting board, dandle board.

(verb) ride on a plank. Synonyms: teeter-totter, teetertotter.

(verb) move up and down as if on a seesaw.

(verb) move unsteadily, with a rocking motion. Synonyms: teeter, totter.