None of Our Business

It’s really none of his business what I do with the money I earn.

Something that is of no concern to another. It’s really none of his business what I do with the money I earn.

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.

(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!