名詞 doornail:

1. a nail with a large head; formerly used to decorate doors

1. The old man was dead as a doornail.
   那老頭已經(jīng)直挺挺地死了。
2. Be careful with that bottle. It's cyanide. One swallow of that and you'd be dead as a doornail.
   當(dāng)心那個(gè)瓶子，那是氰化物。只要喝上一口，就會(huì)叫人一命嗚呼。
3. The treaty may be considered to be as dead as a doornail.
   這項(xiàng)條約可以認(rèn)為是完全作廢了。
4. It lay there with its eyes closed, dead as a doornail.
   它躺在那里眼睛閉著，確實(shí)死了。

door.nail

n.（名詞）
A large-headed nail.
大頭釘

<習(xí)慣用語>dead as a doornail
Undoubtedly dead.
確已死亡的