yo-yo /ˈjo(ˌ)jo/ 溜溜球;游游(一種線軸形玩具，中間繞有拉線，拉動此線後，它會因自身的重量和衝力上升或下降) ;[美俚] (尤指易受人左右擺佈的) 傻瓜,笨蛋
yo-yo n : a toy consisting of a spool that is reeled up and down on a string by motions of the hand
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