'Heel' in the Bible

and enmity I put between thee and the woman, and between thy seed and her seed; he doth bruise thee -- the head, and thou dost bruise him -- the heel.'

and afterwards hath his brother come out, and his hand is taking hold on Esau's heel, and one calleth his name Jacob; and Isaac is a son of sixty years in her bearing them.

And he saith, 'Is it because one called his name Jacob that he doth take me by the heel these two times? my birthright he hath taken; and lo, now, he hath taken my blessing;' he saith also, 'Hast thou not kept back a blessing for me?'