Toy resembling a flat spool which may be made to spin and move up and down a string.

(玩具)溜溜球。

One that resembles a yo-yo, esp. in moving up and down unexpectedly or repeatedly.

像溜溜球那样忽上忽下的东西。

A stupid or foolish person.

【美】【俚】愚人；蠢人。

Going up and down; fluctuating.

上上下下的；起伏不定的。

To move from one position to another repeatedly; fluctuate.

动摇；起伏。