knock down

1.打倒，击倒；撞倒；击落：

The angry man knocked him down.

那个愤怒无比的人将他击倒了。

I carelessly knocked the chair down.

我不小心将椅子撞倒了。

2.毁掉，拆毁，破坏：

It's a pity that the old house was knocked down.

很可惜，那幢老房子被拆毁了。

3.拆卸；拆散(以便于装运)：

The machine has been knocked down ready for shipment.

机器已拆好准备装船。