Question

what is the meaning of idiom achillis heel

Answer 1

a weakness or vulnerable point

Answer 2

Hey there,

Achilles Heel - weakness or vulnerable point inspite of overall strength and might
Achilles was a strong Greek warrior. When he was an infant, he had been dipped in the river stynx and he became invulnerable. except for a little point in his ankle. He died because of the injury he got from an arrow that hit his ankle. His ankle was his vulnerable point, his weakness. thus comes the idiom.

Hope it helps ^_^