I .
( informal , especially BrE ) ( of a machine ) to stop working :
The fax machine's packed up again.
II .
pack up | ˌpack sth ↔ ˈup
1.
to put your possessions into a bag, etc. before leaving a place :
Are you packing up already? It's only 4 o'clock.
We arrived just as the musicians were packing up their instruments.
2.
( BrE , informal ) to stop doing sth, especially a job
SYN give up :
What made you pack up a good job like that?
—see also pack (2)