How long has your ankle been acting up?

你的脚踝受伤多久了？

《牛津词典》

The kids started acting up.

孩子们开始调皮捣蛋起来。

youdao

The TV's acting up again.

这台电视机又出毛病了。

youdao

The Myers are facing prison terms of up to 35 years if they are convicted of the charges against them, which include acting as illegal agents of a foreign government.

VOA: standard.2009.06.06

Part of what's been bothering Franny is her frustration with acting, and that's one of the things that Lane is so surprised she has given up; it was the only thing she was passionate about.

动作的挫败已经让弗兰尼烦恼了,莱恩也很奇怪她放弃了,这是她唯一有激情的事情呀。

耶鲁公开课 - 1945年后的美国小说课程节选

If you need to yell at the kids acting up in the back seat, pull over.

FORBES: Forget Phones Or Fast Food, More Drivers Cause Their Own Distractions In Crashes

It's like pressing the restart button when your computer is acting up.

CNN: What really makes people happy

While an accident or miscalculation could restart the Korean War, there are also reasons to think the North's acting up is all a bluff.

WSJ: Review & Outlook: Calling Kim's Bluff