To deprive of weapons
disable, unarm, weaken, debilitate, render powerless, disqualify, incapacitate, invalidate, deaden, paralyze, muzzle, deprive of weapons, deprive of means of defense, demilitarize, demobilize, put out of combat, put out of action, pacify, conciliate, subdue, subjugate, occupy, bare, strip, tie the hands*, draw the teeth of*, clip the wings of*, spike one's guns*; see also defeat 1, 2, weaken 2.
Antonyms arm*, outfit, equip.
To reduce national armaments
demobilize, disband, demilitarize, deactivate, de-escalate, lay down one's arms, unarm, neutralize, internationalize, remove nuclear competence, prevent nuclear competence; see also disband.
Antonyms arm*, mobilize, prepare.