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Phrase(s): take a leaf out of someone’s book [and] take a page from someone’s book
Fig. to behave or to do something in a way that someone else would. • When you act like that, you’re taking a leaf out of your sister’s book, and I don’t like it! • You had better do it your way. Don’t take a leaf out of my book. I don’t do it well.
McGrawhill's American Idioms And Phrasal Verbs