Learn what "you're making a very big mistake" means, when people say it, and how to use it naturally in English.

It means the speaker believes the other person is about to do something wrong or harmful.
From Help! I’m Falling In Love With My Rude CEO, Episode 31
Someone warns another person that they are about to make a serious error.
Use this to warn someone before they do something risky or foolish. It can sound harsh if said angrily.
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