to stand in a line or row; to form a queue / line Line up, children! Cars lined up waiting to board the ship.
- 1to arrange people or things in a straight line or row The suspects were lined up against the wall. He lined the bottles up along the shelf.
- 2to arrange for an event or activity to happen, or arrange for somebody to be available to do something Mark had a job lined up when he left college. I've got a lot lined up this week (= I'm very busy). She's lined up a live band for the party.