live on borrowed time idiom
(大难未死)继续活着的一段时间，活过寿限
to continue living after a point at which you might easily have died
Since his cancer was diagnosed, he feels as if he's living on borrowed time. 自从他的癌症确诊后，他感觉自己似乎是在苟延残喘。
在预计期限之后继续存在，苟延残喘
to continue to exist longer than expected
It is unlikely that serious decisions will be made by a CEO living on borrowed time. 重大决定是不大可能由一个苟延残喘的首席执行官做出的。