yo-yo /'jaujau; 'jojo/ n toy in the shape of a top with a groove for string, the top moving up and down the string by movement of the fingers: 悠悠; 空鐘(形似陀螺的玩具，上有溝槽，可使之嵌入細(xì)索, 以手操縱該索，此玩具即沿索上下移動(dòng))： The exchange rate is going up and down like a 外匯的匯率就像悠悠一樣忽上忽下。