to deprive (somebody) of a weapon or weapons
to deprive (a country or force) of a means of attack or defence
to make (a bomb, etc) harmless, esp by removing a fuse or warhead
to dispel the hostility or suspicion of (somebody)
to lay aside arms
to reduce or abolish weapons and armed forces
to dispel the hostility or suspicion of
disarmer noun
[Middle English desarmen from Old French desarmer, from dis- + armer: see arm2]