chink in one's armor

Idioms and Phrases

A vulnerable area, as in Putting things off to the last minute is the chink in Pat's armor and is bound to get her in trouble one day . This term relies on chink in the sense of “a crack or gap,” a meaning dating from about 1400 and used figuratively since the mid-1600s.

Example Sentences

But he can understand why others use it in puzzles, since “a chink in one’s armor” is a common expression.

From Slate

The editor then used the word “chink” as an example, noting that it’s “benign in the sense as a chink in one’s armor.”

From Fox News