【俚语】

On the door 守门，看门

【例句】

We should be able to get in free because I know the guy on the door.
我们应该可以免费进去，因为我认识门卫。

Door-to-door 挨家挨户的

【例句】

John is a door-to-door salesman.
John是个挨家挨户推销的推销员。

Show sb. the door
赶走某人，请某人出去

【例句】

Thank you so much for coming in for the interview. John, would you please show Mr. Porter the door?
谢谢你过来面试。John，请送Porter先生出门，好吗？
Sir, if you don't calm down, I'm afraid I'll have to show you the door.
先生，如果你不冷静下来，恐怕我得赶你出去了。

keep the wolf from the door
勉强过活，维持生计

【例句】

This loan will keep the wolf from the door at least, but I'm worried it won't last long.
这笔贷款至少能让我勉强维持生计，但我担心不会长久。