launder (v.)youdaoicibaDictYouDict[launder 词源字典]
1660s, "to wash linen," from noun launder "one who washes" (especially linen), mid-15c., a contraction of lavender, from Old French lavandier "washer, launderer," from Medieval Latin lavandaria "a washer," ultimately from Latin lavare "to wash" (see lave). Criminal banking sense first recorded 1961, from notion of making dirty money seem clean; brought to widespread use during U.S. Watergate scandal, 1973. Related: Laundered; laundering.[launder etymology, launder origin, 英语词源]