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3. none of your business!

none of your business!

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(It's) none of your business!

It is nothing that you need to know. It is none of your concern. (Not very polite.) Alice: How much does a little diamond like that cost? Mary: None of your business! John: Do you want to go out with me Friday night? Mary: Sorry, I don't think so. John: Well, what are you doing then? Mary: None of your business!

See also: none, of