Definition of leaf out : to produce leaves The tree will leaf out in the spring.

What does the phrase on the books mean?

officially employed by a company, or an official member of an organization, society, sports team, etc.: There are 256 people on the books at the cement works. The nursery has 30 babies on the books and 13 on the waiting list. US.

What does it mean to go by the book?

Definition of by the book : by following the official rules very strictly My boss insists on doing everything by the book.