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- DictionaryA·chil·les heel/əˈˌkɪliz ˈhil/
noun
- 1. a weakness or vulnerable point: "the Achilles heel of the case for nuclear power remains the issue of the disposal of waste"
noun
An Achilles' heel is a weakness despite overall strength, which can lead to downfall. While the mythological origin refers to a physical vulnerability, idiomatic references to other attributes or qualities that can lead to downfall are common. Wikipedia