noun
Achilles notch - a small indentation or groove located on the posterior aspect of the calcaneus bone, where the Achilles tendon attaches.
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The surgeon carefully examined the achilles notch before proceeding with the operation.
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I heard that injury to the achilles notch can be quite painful.
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Dude, I think I strained my achilles notch playing basketball last night.
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The company's financial stability hit an achilles notch after losing a major client.