chink in the armor

• chink in the armour (UK spelling)
• chink in one's armor/armour

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chink in the armor (plural chinks in the armor) (American spelling)

1. (idiomatic) A weakness; a weak point (particularly of something formerly considered near-invincible or perfect).

• Achilles heel
• blot on the escutcheon

• “chink in the armor”, in OneLook Dictionary Search.
• “chink in one's armor”, in OneLook Dictionary Search.
• “chink in someone's armor”, in OneLook Dictionary Search.