English phrase from drama scenes

What Does "i know you are up to something" Mean?

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

Beginner
Neutral
Firm
Express Doubt

I know you and your little bitch are up to something

The speaker believes the other person is secretly doing something suspicious.

From I Think My Wife Wants To Kill Me, Episode 18

When do people say this?

Scene Context

The speaker suspects the other person is hiding something.

Usage Scenario

Use this when you suspect deception or a hidden plan. It can sound accusing if said seriously.

Better ways to say it

1
I know you are up to something.
2
You’re up to something.
3
I know you’re hiding something.

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