seesaw/'siːsɔː $ -sɑː/

n. a long board at the either end of which two people sit and move up and down or such a game

n. [C; U] 跷跷板（游戏）：There is a seesaw on the playground. 操场上有一个跷跷板。

◇Let's ride on the seesaw. 我们坐跷跷板吧。