Achilles tendon
US /əˌkɪl.iːz ˈten.dən/
UK /əˌkɪl.iːz ˈten.dən/

1.
a large tendon that runs from the calf muscle to the heel bone
:
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He ruptured his Achilles tendon playing basketball.
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Pain in the Achilles tendon can be a sign of overuse.
a large tendon that runs from the calf muscle to the heel bone