line (something) up

Definition: to put things in a row.

(This phrasal verb has more than one meaning)

E.g.1: Could you line up according to your age? The oldest should stand at the front, and the youngest at the back.
E.g.2: He was bored so he spent the afternoon lining his books up on the shelf.

This phrasal verb can be separated. (E.g.2)