1to drift about; to move unsteadily
2(fig.) to fluctuate; to rise and fall; to be changeable
3(economics) (of a currency or rate etc) to float
Example
rén tǐ人体de的píng jūn平均wēn dù温度zài在3377°°CCshàng xià上下fú dòng浮动。
人体的平均温度在37°C上下浮动。
The temperature of the human body hovers around 37°C.