The one weak point in someone who is very strong.
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One weak point in a person or thing that is otherwise very strong.
An Achilles' heel is the single place where something reliable can still fail, and it often matters most.
The phrase comes from a Greek myth.
"A Blind Spot"
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A weakness you cannot see in yourself
"A Chink in the Armor"
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A small gap in an otherwise solid defense
"Achilles' Heel"
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The one weak point in something strong