Princeton's WordNet

1. seesaw, teeter, teeter-totter, teetertotter, teeterboard, tilting board, dandle board(verb)

   a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end

   Synonyms:
   teeter-totter, teeter, teetertotter, seesaw, dandle board, tilting board, teeterboard

2. teeter-totter, teetertotter, seesaw(verb)

   ride on a plank

   Synonyms:
   seesaw, teeter-totter, teetertotter, teeter, totter

3. seesaw(verb)

   move up and down as if on a seesaw

   Synonyms:
   teeter-totter, teeter, teetertotter, totter

4. teeter, seesaw, totter(verb)

   move unsteadily, with a rocking motion

   Synonyms:
   teetertotter, seesaw, dodder, toddle, teeter, totter, paddle, waddle, teeter-totter, coggle