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Phrase(s): not worth mentioning
1. not important enough to require a comment. • There are others, but they are not worth mentioning. • A small number of books hint at the phenomenon, but they aren’t worth mentioning. 2. [of an error or wrong] not worth apologizing for. • This isn’t a problem at all. It’s not worth mentioning. • No need to apologize to me. No harm done. It’s not worth mentioning.
McGrawhill's American Idioms And Phrasal Verbs