up to no good
idiomatic phrase
informal
: doing bad things or planning to do bad things
If you ask me, that woman's up to no good.
Cite this Entry
“Up to no good.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/up%20to%20no%20good. Accessed 21 Dec. 2025.
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Merriam-Webster unabridged
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