Learn what "i knew you had something up your sleeve" means, when people say it, and how to use it naturally in English.

It means you suspected someone had a hidden plan or advantage.
From I'M Obsessed With My Boss Part Ii, Episode 49
The speaker reacts to someone's secretive behavior and says they expected a hidden motive.
Use this when you think someone was being sneaky or planning something behind the scenes. It can sound accusing, so it is better in informal arguments than in polite conversation.
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