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To put one's belongings into a box, suitcase, or other container to be transported elsewhere. Students, please don't pack up before I'm done the lesson. John was so mad that he started packing up a bag so he could stay somewhere else for the night. I'm sick of your attitude. Pack up—you're fired!
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.