/ dɪsˈɑːm; NAmE -ˈɑːrm/ verb
1.
[ vn ] to take a weapon or weapons away from sb :
Most of the rebels were captured and disarmed.
2.
[ v ] ( of a country or a group of people ) to reduce the size of an army or to give up some or all weapons, especially nuclear weapons
3.
[ vn ] to make sb feel less angry or critical :
He disarmed her immediately by apologizing profusely.
—compare arm
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WORD ORIGIN
late Middle English : from Old French desarmer .