act up

If a child is acting up， they are behaving badly.

如果一個小孩子act up，那就是說他表現的很差，故意搗亂的意思。

I could hear Jonathan acting up downstairs.

我能聽見喬納森在樓下撒潑。

If you act up in class， you will be sent to the principal‘s office。

如果你在課堂上調皮搗蛋，就會被送到校長辦公室.

The driver stopped the school bus because the kids were acting up.

因為孩子們調皮搗蛋，司機把校車停了下來。