on the line
01
used when someone or something is subjected to a serious threat or danger
Idiom
例子
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
Informal例子
The conference call is scheduled for 2 PM, so make sure to be on the line promptly to participate in the meeting.
