'achillize' originates from Greek mythology, specifically the name 'Achilles,' where 'Achilles' was a hero known for his invulnerability except for his heel.

'Achilles' transformed into the verb 'achillize' in modern English to describe the act of making something invulnerable.

Initially, it referred to the mythological hero's invulnerability, but over time it evolved into its current meaning of rendering something invulnerable.