doornail

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Related to as dead as a doornail: at one fell swoop

door·nail

 (dôr′nāl′)
n.
A large-headed nail.
Idiom:
dead as a doornail
Undoubtedly dead.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

doornail

(ˈdɔːˌneɪl)
n
(as) dead as a doornail dead beyond any doubt
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

door•nail

(ˈdɔrˌneɪl, ˈdoʊr-)

n.
a large-headed nail.
Idioms:
dead as a doornail, unquestionably dead.
[1300–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.doornail - a nail with a large head; formerly used to decorate doors
nail - a thin pointed piece of metal that is hammered into materials as a fastener
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

doornail

[ˈdɔːˌneɪl] n as dead as a doornailmorto/a stecchito/a
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in periodicals archive ?
Even though I'm only 10; I've rescued four cats since I came to Dubai and have seen lots more, some skinny and frail, and others as dead as a doornail. So please, don't just take this message for granted.
Without help, that vehicle is as dead as a doornail!