Learn what "watch your mouth you are out of line" means, when people say it, and how to use it naturally in English.

This is a sharp way to tell someone they are being disrespectful or inappropriate.
From An Affair With My Boss, Episode 22
Someone is telling another person to stop speaking disrespectfully in a tense exchange.
Use it in a serious argument when you want to call out rude behavior. It can sound aggressive or threatening, so avoid it in polite conversation or at work.
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