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retreat[retreat 词源字典]

retreat: [14] Retreat and retract [15] are ultimately the same word. Both go back to Latin retrahere ‘draw back’, a compound verb formed from the prefix re- ‘back’ and trahere ‘draw, pull’ (source of English tractor). This passed into Old French as retraire, and its past participle retrait came to be used as a noun meaning ‘withdrawal’ – whence English retreat. Meanwhile the past participle of retrahere, retractus, had been used as the basis of a new Latin verb, retractāre, which passed into English via Old French retracter as retract.
=> contract, distract, retract, tractor[retreat etymology, retreat origin, 英语词源]