Achilles' heel

           When an expression, involving the mention of "Achilles heel" is used, that person is alluding to the
story of  Achilles from Greek mythology. According to the myth, when he was only a baby, it was foretold that he would die in battle. To prevent the tragedy, his mother dipped him into a river said to possess the great power of invincibility. However, when she dipped him in, she held him by the heel leaving it unexposed to the magical river. His heel became his weakness due to his mothers mistake. This weakness proved to be fatal when he was shot in the heel by an arrow in battle. Despite his weakness, he is still remembered as a great warrior. An example of an expression alluding to the story of Achilles would be: Although Dana was on a strict diet, brownies were her Achilles' heel.