Achilles' Heel

This is my word share term 'Achilles heel', it's an idiom which can be refers as one of weak point. Achilles heel come from the word 'Achilles' which is the name of a Greek hero.

Achilles was the son of the nymph Thetis and Peleus, the king of the Myrmidons. Zeus and Poseidon had been rivals for the hand of Thetis until Prometheus, the fore-thinker, warned Zeus of a prophecy that Thetis would bear a son greater than his father. For this reason, the two gods withdrew their pursuit, and had her wed Peleus.When Achilles was born Thetis tried to make him immortal, by dipping him into the river Styx. However, he was left vulnerable at the part of the body by which she held him, his heel.

However, none of the sources before Statius makes any reference to this general invulnerability. To the contrary, in the Iliad Homer mentions Achilles being wounded: in Book 21 the Paeonian hero Asteropaeus, son of Pelagon, challenged Achilles by the river Scamander. He cast two spears at once, one grazed Achilles' elbow, "drawing a spurt of blood". Also, in the fragmentary poems of the Epic Cycle in which we can find description of the hero's death, Cypria (unknown author), Aithiopis by Arctinus of Miletus, Little Iliad by Lesche of Mytilene, Iliou persis by Arctinus of Miletus, there is no trace of any reference to his general invulnerability or his famous weakness (heel); in the later vase paintings presenting Achilles' death, the arrow (or in many cases, arrows) hit his body.