chink in one's armor
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.
|a scrap or morsel of food left at a meal.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
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