fold (something) up
Definition: to make something smaller by bending or turning it so that one part of it lies on another part.
(This phrasal verb has more than one meaning)
E.g.1: When he had finished writing the letter he folded it up and put it in the envelope.
E.g.2: Don’t leave your clothes on the floor! Fold them up neatly and put them in the chest of drawers.
This phrasal verb can be separated. (E.g. 1 and 2)