what's it to you, him, her, etc.?

What's it to (one)?

What does one care? What business is it of one's? I pay my rent and my share of the bills—what's it to him how I spend my money otherwise? What's it to them what I do on the weekends? That's my time to do as I like! A: "Do you mind if I do yoga in the living room?" B: "Of course not! What's it to me?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

what’s it to ˈyou, ˈhim, ˈher, etc.?

(informal) (said when you are annoyed) you, etc. have no right to know something; what does it matter to you, etc: What’s it to her how I spend my money?
Farlex Partner Idioms Dictionary © Farlex 2017
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