›[I or T]to put things into containers so that you can take or send them away: Can you pack up these orders for despatch?They were packing up the office ready for the move.
›[I or T]UKto get ready to leave work, or to put things away because you have finished working with them: It was 6 o'clock and time to pack up for the day.Let's pack up and go.He was packing up his tools and preparing to leave.
›[I]UKinformalif a machine packs up, it stops working: The photocopier's packed up again!