Etymology
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disarm (v.)

late 14c., "deprive of power to injure or terrify, render harmless," a figurative sense, from Old French desarmer (11c.), from des- "reverse of" (see dis-) + armer "to arm" (see arm (v.)). The literal senses "deprive of weapons" (transitive), "put off one's armor or lay down one's weapons" (intransitive) are early 15c. Related: Disarmed; disarming; disarmingly.

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Definitions of disarm

disarm (v.)
remove offensive capability from;
Synonyms: demilitarize / demilitarise
disarm (v.)
make less hostile; win over;
Her charm disarmed the prosecution lawyer completely
disarm (v.)
take away the weapons from; render harmless;
Synonyms: unarm
From wordnet.princeton.edu