English phrase from drama scenes

What Does "you think you know everything but you don't" Mean?

Learn what "you think you know everything but you don't" means, when people say it, and how to use it naturally in English.

Beginner
Rude
Firm
Confront

You think you know everything, but you don't.

It means the speaker is criticizing someone for acting overconfident or arrogant.

From Two Worlds Apart, Episode 42

When do people say this?

Scene Context

The speaker insults the other person by saying they think they know everything but do not.

Usage Scenario

Use this in an argument to call out arrogance. It is common and easy to understand, but it is direct and rude.

Better ways to say it

1
You think you know everything but you don't.
2
You don't know everything.
3
You act like you know everything, but you don't.

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