verb (used with object)
to put out (a fire, light, etc.); put out the flame of (something burning or lighted): to extinguish a candle.
to put an end to or bring to an end; wipe out of existence; annihilate: to extinguish hope.
to obscure or eclipse, as by superior brilliance.
Law. to discharge (a debt), as by payment.

1535–45; < Latin ex(s)tingu(ere) (ex- ex-1 + stinguere to quench) + -ish2

extinguishable, adjective
extinguishment, noun
nonextinguishable, adjective
nonextinguished, adjective
preextinguish, verb (used with object)
preextinguishment, noun
self-extinguishing, adjective
unextinguishable, adjective
unextinguished, adjective

1. quench, smother, snuff out, blow out.

1. light, ignite.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extinguish (ɪkˈstɪŋɡwɪʃ)
1.  to put out or quench (a light, flames, etc)
2.  to remove or destroy entirely; annihilate
3.  archaic to eclipse or obscure by or as if by superior brilliance
4.  law to discharge (a debt)
[C16: from Latin exstinguere, from stinguere to quench]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500 (implied in extinguishable), from L. extinguere "quench, wipe out, obliterate," from ex- "out" + stinguere "quench," from PIE *steig- "to prick, stick, pierce." Related: Extinguished; extinguisher.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

extinguish ex·tin·guish (ĭk-stĭng'gwĭsh)
n. ex·tin·guished, ex·tin·guish·ing, ex·tin·guish·es
To bring about the extinction of a conditioned response.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If you can extinguish the spark, that will light the flame, you will never have a fire.
But when it is low the peat itself catches light, making the fire much harder to extinguish.
Fire officials said it would take days to extinguish the fire, though much of it had been contained.
Smoke alarms can alert you to a fire, and sprinklers can extinguish a blaze.
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