lapse (n.)youdaoicibaDictYouDict[lapse 词源字典]
mid-15c., "elapsing of time, expiration;" also "temporary forfeiture of a legal right," from Middle French laps "lapse," from Latin lapsus "a slipping and falling, flight (of time), falling into error," from labi "to slip, glide, fall." Meaning "moral transgression, sin" is c. 1500; that of "slip of the memory" is 1520s; that of "a falling away from one's faith" is from 1650s.[lapse etymology, lapse origin, 英语词源]
lapse (v.)youdaoicibaDictYouDict
early 15c., said to be from lapse (n.) or from Latin lapsare "to lose one's footing." Related: Lapsed; lapses; lapsing.