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Showing results for chink in one's armor. Search instead for chink-in-one-s-armor.
Synonyms

chink in one's armor

Idioms  
  1. 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.