what's it to you
"What's it to you" is an idiomatic expression used defensively to question someone's interest in a matter perceived as private or irrelevant to them.
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Definition
B2General
(informal, defensive)Used to ask why someone is interested in something, implying it is none of their business.
Example
- When he asked about her plans for the weekend, she snapped, 'What's it to you?'
Similar
Terms that have similar or relatively close meanings to "what's it to you":
who careswhat's withit doesn't matterwhat's upwhat's the matter