Mind your own business! Informal
Meaning: If you say "Mind your own business!" to someone, you're telling them to stop interfering in things that don't concern them, or to stop asking personal questions.
- He got sick of her asking him about his private life so he snapped, "Mind your own business!"
- Someone asked me how much money I earn and I told him to mind his own business.
Julie told Mark to mind his own business after he'd asked her