To make invulnerable or nearly invulnerable, as if by giving someone the protective quality of Achilles from Greek mythology.
From Achilles, the legendary Greek hero of the Trojan War whose body was nearly invulnerable (except for his heel). The suffix -ize means to cause or make something.
This is a rare literary word that carries the entire story of the Trojan War—when someone is 'achillized,' they become almost invincible, but the implication is always that they might have a hidden weakness, just like Achilles's heel.
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