英语词源字典 - 在线词源网站

impugn (v.)[impugn 词源字典]: "attack by argument," late 14c., from Old French impugner, from Latin impugnare "to assault, to attack," from assimilated form of in- "into, in, on, upon" (see in- (2)) + pugnare "to fight" (see pugnacious). Related: Impugned; impugning.[impugn etymology, impugn origin, 英语词源]