see-saw
蹺板
seesaw
n : a plaything consisting of a board balanced on a fulcrum; the
board is ridden up and down by children at either end
[syn: teeter-totter, teeterboard, tilting board, dandle
board]
v 1: ride on a plank
2: move up and down as if on a seesaw
3: move unsteadily, with a rocking motion [syn: teeter, totter]