Definition of “on the line” - English Dictionary

american-english dictionary

“on the line” in American English

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on the line

at risk of failing or being harmed:

His job is on the line.
Firefighters regularly put their lives on the line.

On the line also means speaking on the telephone:

My mom was on the line, but I could hear my dad talking in the background.

(Definition of “on the line” from the Cambridge Academic Content Dictionary © Cambridge University Press)