1. （使）（某一批人）排成行；（使）列队
If people line up or if you line them up, they move so that they are standing in a line.
2. 使（某一批物）排列成行
If you line things up, you move them into a straight row.
3. （使）对齐
If you line one thing up with another, or one thing lines up with another, the first thing is moved into its correct position in relation to the second. You can also say that two things line up, or are lined up.
4. 组织；邀集
If you line up an event or activity, you arrange for it to happen. If you line someone up for an event or activity, you arrange for them to be available for that event or activity.
5. 支持/反对
If you line up with, behind, or alongside a person or group, you support them. If you line up against a person or group, you oppose them.
6. see also: line-up
1. place in a line or arrange so as to be parallel or straight
e.g. align the car with the curb
align the sheets of paper on the table
2. take one's position before a kick-off
3. arrange in ranks
e.g. dress troops
Synonym: dress
4. form a queue, form a line, stand in line
e.g. Customers lined up in front of the store
5. get something or somebody for a specific purpose
e.g. I found this gadget that will serve as a bottle opener
I got hold of these tools to fix our plumbing
The chairman got hold of a secretary on Friday night to type the urgent letter
6. form a line
e.g. The buildings all line up neatly