lavish (adj.)youdaoicibaDictYouDict[lavish 词源字典]
mid-15c., from Middle French lavasse (n.) "torrent of rain, deluge," from Old French lavache, from laver "to wash," from Latin lavare "to wash" (see lave). Related: Lavishly.[lavish etymology, lavish origin, 英语词源]
lavish (v.)youdaoicibaDictYouDict
1540s, from lavish (adj.). Related: Lavished; lavishing.