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deafen

[def-uh n] /ˈdɛf ən/
verb (used with object)
1.
to make deaf:
The accident deafened him for life.
2.
to stun or overwhelm with noise:
The pounding of the machines deafened us.
3.
deaden (def 3).
4.
Obsolete. to render (a sound) inaudible, especially by a louder sound.
Origin
1590-1600
1590-1600; deaf + -en1
Related forms
deafeningly, adverb
half-deafened, adjective
nondeafened, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for half-deafened

deafen

/ˈdɛfən/
verb
1.
(transitive) to make deaf, esp momentarily, as by a loud noise
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
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Word Origin and History for half-deafened

deafen

v.

1590s, "to make deaf," from deaf + -en (1). The earlier verb was simply deaf (mid-15c.). For "to become deaf, to grow deaf," Old English had adeafian (intransitive), which survived into Middle English 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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half-deafened in Medicine

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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