doornail

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Definitions from WordNet

Noun doornail has 1 sense

doornail - a nail with a large head; formerly used to decorate doors
--₁ is a kind of nail

Definitions from the Web

Doornail

Noun:

A large nail with a broad and flat head, formerly used for strengthening and securing a wooden door.

Example Sentence:

He hammered the doornail into the wooden door to secure it firmly.

Noun:

A phrase used to indicate that someone or something is considered dead, lifeless, or beyond resurrection.

Example Sentence:

The project's failure left it as dead as a doornail.

Idiom:

As dead as a doornail

Completely lifeless; thoroughly and irreversibly dead.

Example Sentence:

The idea of getting back together with my ex is as dead as a doornail.