Achilles was a demigod who was dipped in the River of Stix by his mother holding him by his ankle when he was a baby, making him unvulerable. Later, during the Trojan War he was shot with an arrow right on the ankle, the only place on his body that wasn't unvulnerable, and he died.
The weakness of Achilles was that when he was young he was foretold that he would die young .
His heel
An Achilles heal is someone's weakness or flaw.
Achilles' heel was his weak spot thus the saying that someone's weakness is their "Achilles heel."
everyone has a weakness.
Everyone has a weakness. There is nobody who doesn't have an "Achilles' Heel"
''Achilles' ''heel is a seemingly small but actually crucial weakness.''''
He had a weak spot on his heel that is why a weakness is called an Achilles heel
Achilles' heel is an excellent example of an allusion. Say somebody has a certain weakness that can be taken advantage of. That weakness is the person's "Achilles' heel" because according to mythology, Achilles was immortal except for his heel that was not dipped into the River of Styx, A.K.A. his only weakness.
Achilles
his heel was his weakness. there is no specific reason, just that for Achilles in particular his heel was his one weakness.
Achilles' heel. (weakness)