Learn useful ways to say "they really don't" in English with drama examples and natural alternatives.

It means the speaker is warning others not to underestimate them or the person they support.
From In Love With My Godfather's Daughter, Episode 38
Someone warns that other people do not know who they are dealing with.
Use this in a fight or threatening comeback. It is rude and confrontational, so avoid it at work or in polite conversation.
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