1. Sarah started to ask them some very personal questions. They told her to mind her own business
2. They were just sitting on the bus bench, minding their own business , when a stranger approached them and started telling them his life story.

Synonyms: none of (one’s) business! Antonym: stick (one’s) nose in. The expression mind your own business is a common response of annoyance at a prying or rude inquiry. It is a very direct, even rude, response, and is only used between people of equal social standing.