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.