disarm (v.)youdaoicibaDictYouDict[disarm 词源字典]
late 14c., from Old French desarmer (11c.), from des- (see dis-) + armer "to arm" (see arm (v.)). The figurative sense is slightly earlier in English than the literal. Related: Disarmed; disarming.[disarm etymology, disarm origin, 英语词源]