Simple Definition of Achilles' heel
: a fault or weakness that causes or could cause someone or something to fail
Full Definition of Achilles' heel
: a vulnerable point
Examples of achilles' heel in a sentence
I'm trying to lose weight, but ice cream is my Achilles' heel.
<the food supply proved to be the nation's Achilles' heel in its defense against terrorist attacks>
Origin of achilles' heel
from the story that Achilles was vulnerable only in the heel
First Known Use: 1840
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