1.
If you ~ or if you ~ your things, you put your possessions or the things you have been using in a case or bag, because you are leaving.
They packed up and went home...
He began packing up his things.
PHRASAL VERB: V P, V P n (not pron), also V n P
2.
If a machine or a part of the body packs up, it stops working. (BRIT INFORMAL)
In the end it was his stomach and lungs that packed up...
PHRASAL VERB: V P