A singular point of profound vulnerability, weakness, or fatal flaw in an otherwise formidable entity.
"Their weak supply chain proved to be the tech company’s Achilles heel."
"His short temper is his sole Achilles heel as an otherwise brilliant negotiator."
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Grounds psychological states or physical commitment in human bodily anatomy ('heel').
Greek mythology: Achilles’ mother Thetis dipped him in the River Styx for invulnerability, holding him by the heel, which remained dry and mortal.
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