a chink in someone's armour

chink in (one's) armor

A minor but very detrimental flaw or weakness. Yeah, he's brilliant, but his violent temper has destroyed many business relationships—it's really the chink in his armor.
See also: armor, chink

a chink in someone's armour

If someone or something has a chink in their armour, they have a weakness that people can take advantage of, although they seem very strong and successful. Note: `Armour' is spelled `armor' in American English. With their superior knowledge, they might find the chinks in his armour. Labour leaders hope to use their annual conference to attack what they currently see as the most vulnerable chink in the government's armour. Note: A chink is a small hole or opening.
See also: armour, chink

a chink in someone's armour

a weak point in someone's character, arguments, or ideas which makes them vulnerable to attack or criticism.
See also: armour, chink