discomfityoudaoicibaDictYouDict[discomfit 词源字典]
discomfit: [14] The underlying etymological sense of discomfit is ‘destroy’. It comes from desconfit, the past participle of Old French desconfire ‘defeat’; this in turn was a descendant of Vulgar Latin *disconficere ‘destroy, undo’, a compound verb formed from the prefix dis- ‘un-’ and conficere ‘put together, complete, accomplish’ (source of English comfit, confection, and confetti). Its original English meaning ‘defeat’ has weakened over the centuries to ‘disconcert’, probably due to the influence of discomfort, with which it is often confused.
=> comfit, confection, confetti[discomfit etymology, discomfit origin, 英语词源]
discomfit (v.)youdaoicibaDictYouDict
c. 1200, as an adjective, from Old French desconfit "vanquished, defeated," past participle of desconfire "to defeat, destroy," from des- "not" (see dis-) + confire "make, prepare, accomplish," from Latin conficere (see confection).

Used as a verb in English from c. 1300. Weaker sense of "disconcert" is first recorded 1520s in English, probably by confusion with discomfort. Related: Discomfited; discomfiting.