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cousin[cousin 词源字典]

cousin: [13] The word cousin is etymologically related to sister. It comes via Old French cosin from Latin consobrīnus, which meant literally ‘child of one’s mother’s sister’ – that is, ‘cousin on one’s mother’s side’ (consobrīnus was a compound noun formed from the prefix com- ‘together’ and sobrīnus ‘maternal cousin’, a derivative of soror ‘sister’ and relative of English sister).

By the time it entered English, it had already broadened out in meaning to cover paternal as well as maternal cousins, and indeed in the Middle Ages it was applied more generally still to any relative other than one’s parents or brother and sister (probably through association with Latin consanguineus ‘blood relative’).
=> sister[cousin etymology, cousin origin, 英语词源]