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 .