up to no good
This page is about the idiom up to no goodINFORMAL
If someone is up to no good, they are doing something bad, or something wrong.
- I can always tell when young Bobby is up to no good. He can't look me in the eye.
- Jenny found some text messages in her husband's phone that made her suspect he was up to no good.
The media suspected some government members had been up to no good because they
Contributor: Matt Errey