none of one's business

Idioms  

1. Not one's concern, as in How much I earn is none of your business. This expression employs business in the sense of “one's affairs,” a usage dating from about 1600. (Also see mind one's own business.) A slangy, jocular variant from about 1930 is none of one's beeswax. The related verb phrase have no business is used to indicate that one should not meddle or interfere, as in He has no business discussing the will with outsiders.

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Example Sentences

What was none of one's business might change its name should importunity take the form of utility.

From Project Gutenberg

You do see, then, that our psychologic glow doesn't, after all, prevent the thing——" "From being none of one's business?

From Project Gutenberg