n. a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either endv. move up and down as if on a seesaw
n. 跷跷板, 跷跷板游戏, 起伏交替的动作a. 上下或前后摇动的, 交互的vi. 玩跷跷板, 上下或来回摇动vt. 使上下或来回摇动