what's it to (someone)

idiom

Definition of what's it to (someone)

informal
: why does (someone) want to know used to respond in a somewhat angry or annoyed way to a question that one does not want to answer"He wants to know much they pay you?" "Why? What's it to him?"

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“What's it to (someone).” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/what%27s%20it%20to. Accessed 14 December 2019.

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