verb (used with object)
to deprive of a weapon or weapons.
to remove the fuze or other actuating device from: to disarm a bomb.
to deprive of the means of attack or defense: The lack of logic disarmed his argument.
to divest or relieve of hostility, suspicion, etc.; win the affection or approval of; charm: His smile disarmed us.
verb (used without object)
to lay down one's weapons.
(of a country) to reduce or limit the size, equipment, armament, etc., of the army, navy, or air force.

1325–75; Middle English < Old French desarmer. See dis-1, arm2

disarmer, noun
undisarmed, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disarm (dɪsˈɑːm)
1.  (tr) to remove defensive or offensive capability from (a country, army, etc)
2.  (tr) to deprive of weapons
3.  (tr) to remove the triggering device of (a bomb, shell, etc)
4.  (tr) to win the confidence or affection of
5.  (intr) (of a nation, etc) to decrease the size and capability of one's armed forces
6.  (intr) to lay down weapons

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

late 14c., from O.Fr. desarmer (11c.), from des- "dis-" + armer (see arm (2)). The figurative sense is earlier in English than the literal. Related: Disarming.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
To persuade them to disarm, they need to be taught other ways of making a
And by seeing how these cells act when confronted with a new invader,
  researchers are hoping to disarm the enemy far in advance.
He must simultaneously suggest offensiveness and disarm it, with an invitation
  to hip complicity.
Our immune system constantly produces antibody molecules, which identify and
  disarm foreign particles, termed antigens.
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