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To put one's belongings into a box, suitcase, or other container to be transported elsewhere. I'm sick of your crappy attitude. Pack up—you're fired! John was so mad that he started packing up a bag so he could stay somewhere else for the night.
pack something up (in something)
to prepare something to be transported by placing it into a container. Gerry will pack the dishes up in a strong box, using lots of crumpled paper. Please pack up the dishes carefully.
to prepare one's belongings to be transported by placing them into a container; to gather one's things together for one's departure. If we are going to leave in the morning, we should pack up now. I think you should pack up and be ready to leave at a moment's notice. He didn't say good-bye. He just packed up and left.
1. To put the belongings one is traveling with into some container that will be used to transport them: We packed the car up and left for Canada. I packed up my suitcase and put it in the car.
2. To gather or tie some group of things together in a package: I packed up your books in that box for you. I packed my old clothes up and sent them to the shelter.