Learn what "that is none of your business" means, when people say it, and how to use it naturally in English.

This means the speaker refuses to discuss something because it is private.
From The Missing Piece, Episode 39
Someone shuts down another person's attempt to ask about a private matter.
Use it to stop someone from asking about something personal. It sounds rude or harsh, so it works better in arguments than in polite conversation.
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