ennoble (v.)youdaoicibaDictYouDict[ennoble 词源字典]
late 15c., "refine, impart a higher character to" (implied in ennobled), from Middle French ennoblir; see en- (1) + noble (adj.). Sense of "give noble rank to" is from 1590s. Related: Ennobler; ennobling.[ennoble etymology, ennoble origin, 英语词源]