up to no good

Idioms  

1. see up to, def. 3.

---

Example Sentences

But Google used insights from the hacking attempt to help its model understand when users are up to no good—and refuse to help.

From The Wall Street Journal

Although she did admit she was “up to no good” as a high school student at Oakwood School in North Hollywood, Whitaker said her upbringing was not as wild as Alani’s, and she does not possess the character’s desire to coast off her surname.

From Los Angeles Times

This year’s rendition is filled with murderous red-eyed ravens up to no good, and in true Haunted Mansion fashion it has a pun for a name.

From Los Angeles Times

“Tomorrow my alma mater will become the School for Miserable Girls, and there will be no singing of the school song, ever again. I expect Baroness Hoover will make a rule against dancing chickens, once she discovers that they exist. Edward Ashton is up to no good, and I have failed to stop him....It is all...my...fault....”

From Literature

He went by the name of Judge Quinzy, and Penelope had reason to fear he was up to no good.

From Literature