Meaning: Stop doing something
Example: You should PACK UP smoking.
Meaning: Finish work
Example: We had nothing left to do, so we PACKED UP early.
Meaning: Break down, stop working
Example: My printer PACKED UP last night- I'll have to get a new one.
Meaning: Collect things and put them where you keep them
Example: At the end of the presentation, I PACKED UP my laptop.