Learn what "i mean he's definitely up to something" means, when people say it, and how to use it naturally in English.

It means the speaker thinks someone is secretly planning or doing something bad or sneaky.
From Blood Contract, Episode 4
The speaker says they suspect someone is hiding a plan.
Use this in everyday conversation when you suspect someone is hiding something. It is common, but the tone can become accusatory if you say it strongly.
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