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

This is a warning that the speaker is not to be underestimated.
From Undercovered Heart, Episode 6
A person says the other side does not realize how dangerous or powerful they are.
Use this in confrontational scenes or threats. It sounds aggressive and is not appropriate for polite everyday conversation.
Scenes unlock real expressions as you watch
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