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not someone's problem
Definition of not someone's problem
—used to say that someone is not responsible for dealing with something The fact that you're late is not my problem.
From the M-W Editors
Word by Word Definitions
problemplay
: a question raised for inquiry, consideration, or solution
: a proposition in mathematics or physics stating something to be done
: an intricate unsettled question
: dealing with a problem of conduct or social relationship
: difficult to deal with
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