yo-yo

[[t]ˈyoʊ yoʊ[/t]]

n. pl. -yos,

1) gam a spoollike toy that is spun out and reeled in by an attached string that loops around the player's finger

2) cvb something that fluctuates or moves up and down, esp. suddenly or repeatedly

3) cvb Slang. a stupid, foolish, or incompetent person

4) cvb inf to move up and down or back and forth; fluctuate or vacillate

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Etymology: earlier, a U.S. trademark for such a toy (1932); recorded in 1915 as the name of a Philippine toy