take a leaf out of book
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take a leaf out of (one's) book
To do something in the way someone else would do it; to behave or act like someone else. I think I'm going to take a leaf out of your book and start going for a run first thing in the morning.
take a leaf out of someone's bookand 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.
take a leaf out of someone's book, to
To imitate someone; to follow someone’s example. Literally, this expression alludes to either vandalism (tearing a page from a book) or plagiarism (copying someone else’s work). The figurative use of the term, which dates from about 1800, is much less nefarious. B. H. Malkin used it in his translation of Gil Blas (1809), “I took a leaf out of their book,” meaning simply, “I imitated them,” or “I followed their example.”