dead as a dodo

(redirected from deader than a doornail)

*dead as a dodo

 and *dead as a doornail; deader than a doornail
dead; no longer in existence. (*Also: as ~.) That silly old idea is dead as a dodo. When I tried to start my car this morning, I discovered that the battery was deader than a doornail.
See also: dead, dodo