none of business

none of (one's) business

Something that is of no concern to another. It's really none of his business what I do with the money I earn.See also: business, none, of

none of someone's business

not of someone's concern. (A gentle rebuke.) Q: When are you going to leave for home? A: None of your business. How I managed to afford all this is none of your business.See also: business, none, of