verb (used without object) Slang.
to break or fail, as a machine or engine (often followed by out): The engine conked out halfway there.
to slow down or stop; lose energy (often followed by out).
to go to sleep (usually followed by off or out).
to lose consciousness; faint (usually followed by out).
to die (usually followed by out).
Origin of conk2
First recorded in 1915–20; perhaps of imitative orig.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for conk outcrash
British Dictionary definitions for conk out
verb (intr, adverb) informal
(of machines, cars, etc) to fail suddenly
to tire suddenly or collapse, as from exhaustion
Word Origin for conk out
C20: of uncertain origin
to strike (someone) a blow, esp on the head or nose
a punch or blow, esp on the head or nose
the head or (esp Brit and NZ) the nose
Word Origin for conk
C19: probably changed from conch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for conk out
as in conk out, 1918, coined by World War I airmen, perhaps in imitation of the sound of a stalling motor, reinforced by conk (v.) "hit on the head," originally "punch in the nose" (1821), from conk (n.), slang for "nose" (1812), perhaps from fancied resemblance to a conch (pronounced "conk") shell.
Online Etymology Dictionary, © 2010 Douglas Harper
Idioms and Phrases with conk out
Stop functioning, fail, as in The engine finally conked out. [Colloquial; early 1900s]
Fall asleep, as in Every evening he conked out in front of the television set. [1940s]
Faint or collapse, as in I don't know if it was the heat, but she suddenly conked out. [1920s]
Die, as in He's paranoid about conking out and he's only twenty! [Late 1920s]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.