Athletes often stretch their Achilles tendon before exercise.
The term is based on the Myth of Achilles.
In Greek mythology, Achilles was made invulnerable by being dipped in the river Styx by his mother. Unfortunately, she held him by one of his heels which did not get wet. He was eventually killed by a poison arrow that struck his heel.
Fifteen years later he proudly showed me the permanent scar inflicted by that fall: a pair of shiny, dime-size marks bracketing his Achilles tendon.
Jon Krakauer -- Into Thin Air
Then I developed severe tendinitis in my left Achilles tendon and a shinsplint in my right leg.
Li Cunxin -- Mao’s Last Dancer
Therefore, in every system of theology there is an umbilical point, an Achilles tendon which the finger of mother life has touched, and where the possibility of perfect knowledge has beenimpaired.
Joseph Campbell -- The Hero With a Thousand Faces
Margo started to step out of the water, and I could see her Achilles tendon tensing, and before I could even say anything, the snake lashed out and bit her left ankle, right below the line of her jeans.
John Green -- Paper Towns
It’s better to be conservative and take what you can get than take a big gamble and blow it, so Enzo reaches in, even as Raven is looking down at him, and severs Raven’s left Achilles tendon.