mind one's own business

present singular third person minds one's own business · participle present minding one's own business · participle past minded one's own business · past minded one's own business · alternative mind one's business

1. idiomaticTo concern oneself only with what is of interest to oneself and not interfere in the affairs of others.

   I was just walking down the road, minding my own business, when I was attacked by a mugger.

   2 more examples

   The idea is but too prevalent in almost every community, that a man has discharged his duties as a citizen, well enough, if he minds his own business and does not meddle with the affairs of his neighbours. "Look out for Number One," is a great fundamental maxim, which is in every body's mouth, and which every body takes credit to himself for acting upon. It is preached to us sometimes from the pulpit even, and Christians, as well as infidels, pride themselves upon the assiduity with which they can look out for "Number One."

   1846, “Moral Responsibilities”, in The British Friend: A Monthly Journal Chiefly Devoted to the Interests of the Society of Friends, volume 4, number 8, page 204

   Strolling along, minding my own business Well, there goes a girl and a half

   1977, “Peaches”, performed by the Stranglers

   Synonyms: stick to one's knitting, MYOB, paddle one's own canoe, skate one's lane, stay in one's lane