Etymology
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Esau

biblical son of Isaac and Rebecca, elder twin who sold his birthright to his brother Jacob for "a mess of pottage" (Genesis xxv), hence "used symbolically for: one who prefers present advantage to permanent rights or interests" [OED].

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Definitions of Esau

Esau (n.)
(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;
From wordnet.princeton.edu