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

This 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 0
Someone warns another person that they are making a serious mistake.
Use it to warn someone before they act. It can sound serious and critical, especially in an argument.
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