take a leaf from (one)
To do something in the way one would do it; to behave or act like one. I think I'm going to take a leaf from you and start going for a run first thing in the morning. Our youngest son was always very placid as a baby, but now that he's getting older, he's begun taking a leaf from our older boy.
take a leaf from (someone)
To use (someone) as an example.
take a leaf from
/out of (someone's) book To use (someone) as an example.