knock somebody down 将某人给击倒在地

knock over 不小心把…撞到

knock down 漫游；漫谈，随意地谈谈

knock off 提前下班

the school of hard knocks 逆境把人锤炼成才

The boxer knocked his opponent down.

那位拳击运动员把对手击倒了。

I think I'll go and knock around in California.

我就漫游一下加州吧。

I’m going to knock off work early this afternoon.

我今天要提早下班。