English phrase from drama scenes

What Does "they have no idea who they're dealing with" Mean?

Learn what "they have no idea who they're dealing with" means, when people say it, and how to use it naturally in English.

Intermediate
Neutral
Firm
Threaten

They have no idea who they're dealing with.

This is a warning that the speaker is not to be underestimated.

From Undercovered Heart, Episode 6

When do people say this?

Scene Context

A person says the other side does not realize how dangerous or powerful they are.

Usage Scenario

Use this in confrontational scenes or threats. It sounds aggressive and is not appropriate for polite everyday conversation.

Better ways to say it

1
They have no idea who they're dealing with.
2
You have no idea who you're dealing with.
3
They don't know who they're dealing with.

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Threatening Phrases in English

What Does "they have no idea who they're dealing with" Mean? - ReelFluent