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on the line
01
used when someone or something is subjected to a serious threat or danger
Idiom
Example
The fate of the company hangs on the line as the board decides on the new CEO.
With the championship match tied, everything is on the line for the tennis player in the final set.
02
used for saying that someone is waiting or talking on a telephone
Idiom
InformalExample
While I was on the line with the customer service representative, I explained my issue and asked for assistance.
The conference call is scheduled for 2 PM, so make sure to be on the line promptly to participate in the meeting.
