An Achilles can refer to two different things:
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Achilles heel: This is a weakness in spite of overall strength, which can lead to downfall. While the mythological origin refers to a physical vulnerability, idiomatic references to other attributes or qualities that can lead to downfall are common. The term "Achilles heel" dates back to 1840 and is used to mean "area of weakness, vulnerable spot".
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Achilles tendon: This is the largest and strongest tendon in the body, located in the back of the leg. It connects the calf muscles to the heel bone and is used when walking, running, and jumping. An Achilles tendon injury can occur when the tendon is over-stretched and tears partially or completely, resulting in immediate sharp pain in the back of the ankle and lower leg that can affect the ability to walk properly. Treatment for an Achilles tendon injury can include rest, medicine, exercises, and surgery.
