(Old Testament) the eldest son of Isaac who would have inherited the covenant that God made with Abraham and that Abraham passed on to Isaac; he traded his birthright to his twin brother Jacob for a mess of pottage 神がアブラハムと作り、そしてアブラハムがイサクに渡した契約を引き継いだイサクの長男。彼は、目前の小利のために彼の双子の兄弟ヤコブに彼の相続権を売った。
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