countermand (v.)youdaoicibaDictYouDict[countermand 词源字典]
early 15c., from Old French contremander "reverse an order or command" (13c.), from contre- "against" (see contra-) + mander, from Latin mandare "to order" (see mandate (n.)). Related: Countermanded; countermanding. [countermand etymology, countermand origin, 英语词源]