on the line

prepositional phrase4

1. •
   (figurative) At risk, as in a contest or enterprise.

   • The survival of the company is on the line with this project.
2. •
   Currently calling on the telephone.

   • I have John on the line for you.
3. •
   On one of the lines marked on a playing field or court; (by extension) within bounds.

   • The ball was on the line but the umpire ruled it out.
4. •
   On a level with the eye of the observer, as of a picture hung in on a wall.