ersatz (adj.)youdaoicibaDictYouDict[ersatz 词源字典]
1875, from German Ersatz "units of the army reserve," literally "compensation, replacement, substitute," from ersetzen "to replace," from Old High German irsezzen, from ir-, unaccented variant of ur- (see ur-) + setzen "to set" (see set (v.)). As a noun, from 1892.[ersatz etymology, ersatz origin, 英语词源]