un nerve

unnerve

[uhn-nurv]
verb (used with object), unnerved, unnerving.
to deprive of courage, strength, determination, or confidence; upset: Fear unnerved him.

Origin:
1595–1605; un-2 + nerve

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World English Dictionary
unnerve (ʌnˈnɜːv)
 
vb
(tr) to cause to lose courage, strength, confidence, self-control, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

unnerve
1621, "to destroy the strength of," from un- (2) + nerve. Meaning "to deprive of courage" is recorded from 1704.
Online Etymology Dictionary, © 2010 Douglas Harper
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