"That's My Achilles' Heel" Choose Allusion Hyperbole Idiom Meiosis (understatement) Onomatopoeia (e)

**Idiom** is the correct answer. "Achilles' heel" is a common idiom that refers to a person's area of vulnerability or weakness. It alludes to the Greek myth of Achilles, who was invulnerable except for his heel. Therefore, the phrase is a figurative expression whose meaning isn't literal.