Save the day:

反敗為勝;挽救局面

例句：

The team was expected to lose, but Sally made three points and saved the day.

本來打算會(huì)輸?shù)?，但Sally進(jìn)了個(gè)三分球，最后反敗為勝。

Late in the day:

為時(shí)已晚;坐失良機(jī)

例句：

①What with one thing and another, it was fairly late in the day when we returned to town.

忙完這個(gè)又忙那個(gè)，等到我們回到鎮(zhèn)里的時(shí)候，天色已經(jīng)很晚了。

②It’s a little late in the day to start talking about policy changes.

現(xiàn)在開始談?wù)摳淖冋撸延悬c(diǎn)為時(shí)過晚。

A black day:

倒霉的一天;黑暗的一天

例句：

When we heard the news that David had died, we knew it was going to be a black day for all of his loyal fans.

當(dāng)我們聽到大衛(wèi)去世的消息時(shí)，我們知道對(duì)他所有忠實(shí)的粉絲來說這將是黑暗的一天。