failyoudaoicibaDictYouDict[fail 词源字典]
fail: [13] Fail, fallacy [15], fallible, false, and fault all come ultimately from the same source – the Latin verb fallere. This originally meant ‘deceive’, but it developed semantically to ‘deceive someone’s hopes, disappoint someone’, and in its Vulgar Latin descendant *fallīre this meaning had progressed to ‘be defective, fail’. English acquired the word via Old French faillir. Its Anglo-Norman form, failer, came to be used as a noun, and is the source of English failure [17].
=> faliacy, fallible, false, fault[fail etymology, fail origin, 英语词源]