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defraud (v.)

late 14c., defrauden, "deprive of right, by deception or breech of trust or withholding," from Old French defrauder, from Latin defraudare "to defraud, cheat," from de- "thoroughly" (see de-) + fraudare "to cheat, swindle" (see fraud). Related: Defrauded; defrauding.