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, 
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formal
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How many times in the short two weeks he'd known her had she put herself on the line for him?
He could never again ask them to set their lives on the line.
And thank you very much for being so ready to stand on the line.
His work of the past two and a half years was on the line right now.
A few minutes later he came back on the line.
We were down by 3 points with the game on the line.
The 32-year-old King still wants and gets the shot when the game is on the line.
He had a job to do and his future was on the line here.
No I've not long put them out on the line.
Then, a half hour later, she came back on the line and started talking.
Synonym:
Idiome