not someone's concern
none of someone's concernor
no concern of someone's
Definition of not someone's concern
: not something one is responsible for or involved in Her affairs are not my concern. That's no concern of yours.
Word by Word Definitions
: some person : somebody
: to relate to : be about
: to bear on
: to have an influence on : involve
: marked interest or regard usually arising through a personal tie or relationship
: an uneasy state of blended interest, uncertainty, and apprehension
: something that relates or belongs to one : affair
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