featyoudaoicibaDictYouDict[feat 词源字典]
feat: [14] Etymologically, a feat is ‘something that is done’. The word comes via Old French fet from Latin factum ‘deed’, a noun based on the past participle of facere ‘make, do’, and is hence a doublet of English fact – that is to say, both words go back to an identical source, but have become differentiated (in this case because fact came directly from Latin, whereas feat was filtered through Old French).
=> fact, factory, fashion, feasible, feature[feat etymology, feat origin, 英语词源]
feat (n.)youdaoicibaDictYouDict
mid-14c., "action, deeds," from Anglo-French fet, from Old French fait "action, deed, achievement" (12c.), from Latin factum "thing done," a noun based on the past participle of facere "make, do" (see factitious, and compare fact). Sense of "exceptional or noble deed" arose c. 1400 from phrase feat of arms (French fait d'armes).