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English word disarm comes from Anglo-Norman desarmer.

Disarm etymology ?

Disarm detailed word origin explanation

Dictionary entryLanguageDefinition
desarmer Anglo-Norman (xno)
desarmen Middle English (enm)
disarm English (eng) (intransitive) To lay down arms; to stand down.. (intransitive) To reduce one's own military forces.. (transitive) To deprive of the means or the disposition to harm; to render harmless or innocuous. (transitive) To deprive of weapons; to deprive of the means of attack or defense; to render defenseless.. (transitive) To disable the security systems on.