disarm

Short definition from Wiktionary

Verb

1. 1
   To deprive of weapons; to deprive of the means of attack or defense; to render defenseless.
2. 2
   To deprive of the means or the disposition to harm; to render harmless or innocuous.
3. 3
   To lay down arms; to stand down.
4. 4
   To reduce one's own military forces.
5. 5
   To render into a state in which something is no longer armed, or prepared for use (such as to disable the security systems on).

Noun

1. 1
   The act of depriving a person of a weapon they carry.