1、knock off

使减少；使降低

Udinese have knocked 10% off admission prices.

乌迪内斯队将入场费降低了10%。

He has knocked 10 seconds off the world record.

他将世界纪录缩短了10秒。

下班；收工

If I get this report finished I'll knock off early.

如果我写完这篇报告，我就会早点下班。

What time do you knock off?

你什么时间下班？

杀死

He had many motives for wanting to knock off Yvonne.

他有很多杀伊冯娜的动机。

People don't just knock one another off like this unless there's big money at stake.

如果不是为了冒险赚大钱，人们不会像这样彼此残杀。

2、come back

回忆起;回想起来

He was also an MP — I'll think of his name in a moment when it comes back to me.

他当时也是一位国会议员，他的名字我得想一下才能记起来。

When I thought about it, it all came back.

当我回想起来，往事全都涌上了心头。

重新流行;再度时兴

I'm glad hats are coming back.

我很高兴又开始流行戴帽子了。