Dictionary.com
Thesaurus.com

up to no good

Idioms  
  1. see up to, def. 3.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

They say they knew the cheating team had been up to no good for "ages".

From BBC • Nov. 14, 2025

I feel like Monkey's always up to no good.

From Salon • Feb. 2, 2024

The Georgia legislature recognized that people who are up to no good can abuse our citizens’ security and the public order just as gravely while wearing a business suit.

From Slate • Aug. 15, 2023

“But to them it’s suspicious that you’re up to no good or you’re doing something that you shouldn’t be doing.”

From Los Angeles Times • Jul. 5, 2023

Doesn’t have his running lights on, so I know he’s up to no good.

From "The Young Man and the Sea" by Rodman Philbrick