Questions about example sentences with, and the definition and usage of "Achilles"

A: I knew it was her one weakness.

Achilles was dipped in the river Styx as a baby to make him invulnerable, but he was held by his heel, so that was his only remaining vulnerable spot. He died from being shot there with an arrow.

A: a weakness or weak point

A: The Achilles' tendon is the tendon at the back of the foot. Achilies only weak spot was that tendon

A: Yes, they are the same meaning.

A: gold : 금

A: Yes. You could also say "That was quite a sight."

A: would not have lent him his armors*

A: If Achilles can run ten times faster than a tortoise, then while Achilles runs ten meters, the tortoise will run a meter.

A: *heel. Es tracta del taló d'Aquil•les, no del seu pujol ;)

A: It is not a double "ss" like boss's wife. but I would write it like you!