be on the line(redirected from is on the line)
be on the line
1. To be in a state of jeopardy or uncertainty. I'm afraid that my scholarship is on the line now that I've been accused of plagiarizing a paper.
2. To be speaking or waiting on the telephone. Mr. Parker, when you're ready, Louise in Sales is on the line. I've been on the line for an hour, and still no one has answered.