saved by the bell
01
rescued from an unpleasant or difficult situation at the last moment by an unexpected event, action, or intervention
例子
Just when he was about to start yelling at me, the fire alarm went off and saved me by the bell.
02
(boxing) rescued from being knocked out by the ringing of the bell at the end of a round
例子
Saved by the bell... Now go back to your corner and come back to me the next round.
