saved by the bell
乘时救援
口语·最后时刻脱困
英文释义
to be rescued or helped at the last possible moment
例句
I was saved by the bell when the phone rang during my speech.
典故来源
源自拳击比赛，铃声结束回合可避免被击倒；也指葬礼中防止活埋的铃铛。