defrock (v.)youdaoicibaDictYouDict[defrock 词源字典]
1580s, from French défroquer (15c.), from de- (see de-) + froque "frock" (see frock). Related: Defrocked. A Modern English verb frock "supply with a frock" is attested only from 1828 and probably is a back-formation from this.[defrock etymology, defrock origin, 英语词源]