/ˈsiːsɔː/
名词/动词。指跷跷板(一种儿童游戏设施,两端各坐一人,交替上下起伏);也可比喻事物在两种状态之间来回变化、摇摆不定。
The children played on the seesaw in the park after school.
放学后,孩子们在公园里玩跷跷板。
The negotiations seesawed between progress and deadlock for several months before a final agreement was reached.
谈判在进展与僵局之间反复拉锯了数月,最终才达成协议。
该词最早出现于17世纪,源自锯木工人来回拉锯时的动作。see 和 saw 模仿了锯子一来一回的节奏感,属于叠词构造(reduplication)。后来这个词被用来指代儿童玩的跷跷板,因为跷跷板上下交替的动作与拉锯非常相似。由此进一步引申出"反复变化、摇摆不定"的比喻义。