Learn what "you don't know who you are dealing with" means, when people say it, and how to use it naturally in English.

It means the speaker is warning the other person that they are more dangerous or powerful than expected.
From Love’s Perfect Crime, Episode 4
Someone warns the other person not to underestimate who they are dealing with.
Use this in confrontations or dramatic threats. It sounds strong and is common in fight scenes, but not polite everyday speech.
Scenes unlock real expressions as you watch
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