Definition of Achilles notch
: a U-shaped or V-shaped indentation in the collar of a shoe that is designed to lessen the pressure that the shoe puts on the wearer's Achilles tendon An Achilles notch in shoes or mid- and low-top boots will accommodate the Achilles tendon in plantar flexion. — John Vonhof, Fixing Your Feet, 2006
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First Known Use of achilles notch
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