relapse (v.)youdaoicibaDictYouDict[relapse 词源字典]
early 15c., "renounce;" 1560s, "fall into a former state," from Latin relapsus, past participle of relabi "slip back, slide back, sink back," from re- "back" (see re-) + labi "to slip" (see lapse (n.)). Related: Relapsed; relapsing.[relapse etymology, relapse origin, 英语词源]
relapse (n.)youdaoicibaDictYouDict
mid-15c., from relapse (v.).