verb (used with object)
to make deaf: The accident deafened him for life.
to stun or overwhelm with noise: The pounding of the machines deafened us.
deaden ( def 3 ).
Obsolete. to render (a sound) inaudible, especially by a louder sound.

1590–1600; deaf + -en1

deafeningly, adverb
half-deafened, adjective
nondeafened, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deafen (ˈdɛfən)
(tr) to make deaf, esp momentarily, as by a loud noise

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

1590s, "to make deaf," from deaf. The earlier verb was simply deaf (mid-15c.). For "to become deaf, to grow deaf," O.E. had adeafian (intrans.), which survived into M.E. as deave but then took on a transitive sense from mid-14c. and sank from use except in dialects (where it
mostly has transitive and figurative senses), leaving English without an intransitive verb here.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deafen deaf·en (děf'ən)
v. deaf·ened, deaf·en·ing, deaf·ens
To make deaf, especially momentarily by a loud noise.

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
Try some sciences that actually help mankind, not blind and deafen him to the truth.
The cheering was perfectly deafen, ng, and was prolonged from that time ou almost without cessation.
So many workmen are employed that the din of the hammers was deafen ing.
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