Learn what "i know you are up to something" means, when people say it, and how to use it naturally in English.

The speaker believes the other person is secretly doing something suspicious.
From I Think My Wife Wants To Kill Me, Episode 18
The speaker suspects the other person is hiding something.
Use this when you suspect deception or a hidden plan. It can sound accusing if said seriously.
Scenes unlock real expressions as you watch
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