defraud (v.)youdaoicibaDictYouDict[defraud 词源字典]
mid-14c., from Old French defrauder, from Latin defraudare "to defraud, cheat," from de- "thoroughly" (see de-) + fraudare "to cheat, swindle" (see fraud). Related: Defrauded; defrauding. [defraud etymology, defraud origin, 英语词源]