mind own business
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mind (one's) own business
To not interfere in someone else's affairs; to not pry or be nosy. Often used as an imperative. Mind your own business, will you? I can take care of my problems just fine. I really wish she would mind her own business and stop asking me about my finances. So there I was, minding my own business, when the security guard comes over and starts asking me all kinds of questions.
mind one's own business
Fig. to attend only to the things that concern one. Leave me alone, Bill. Mind your own business. I'd be fine if John would mind his own business.