on the line
US /ɑn ðə laɪn/
UK /ɑn ðə laɪn/

1.
岌岌可危, 处于危险之中
at risk; in a position where one might lose something important
:
•
His reputation is on the line with this new project.
他的声誉因这个新项目而岌岌可危。
•
Many jobs are on the line if the company fails.
如果公司失败,许多工作都岌岌可危。
2.
在电话上, 正在通话
on the telephone
:
•
I have Mr. Johnson on the line for you.
约翰逊先生正在电话上找您。
•
Please hold, I have another call on the line.
请稍等,我还有另一个电话在通话中。