Have time to kill 没事可做；打发时间…(have spare time with nothing to do)

If you have some time to kill maybe, you could come see my new apartment.

“Want to go to the store with me?” asked Kim. “Sure, I have some time to kill,” said Lisa.

live on borrowed time (大难未死)继续活着的一段时间，活过寿限, 在预计期限之后继续存在，苟延残喘…(it is likely that this thing will die or cease to exist soon)

Since his cancer was diagnosed, he feels as if he's living on borrowed time.

The company has been on borrowed time ever since those risky investments in 2007 went sour.

turn back time/turn back the clock 回想，追溯 (to remember or recreate a time from the past)

Now we're going to turn back the clock with some rock and roll from the 1950s.

In the nick of time 在紧要关头；在最后一刻；及时，恰好(at the last possible moment)

We got there just in the nick of time.

She escaped from her smoke-filled home just in the nick of time.