not someone's problem

idiom

Definition of not someone's problem

used to say that someone is not responsible for dealing with somethingThe fact that you're late is not my problem.

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“Not someone's problem.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/not%20someone%27s%20problem. Accessed 6 December 2019.

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