to arrange people or things in a straight line or row
Example:
- The suspects were lined up against the wall.
- He lined the bottles up along the shelf.
to arrange for an event or activity to happen, or arrange for somebody to be available to do something
Example:
- 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.