(deyim) 1. An narrow opening and vunerable area in one's armor that the opponent will usually aim for. 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. 2. A figurative term for a one's weakness, largest flaw or their prevention of success
We would have aced this presentation if Leo wasn't in our group. He didn't study at all, he's the chink in the armor.