chink in someone's armor
US /tʃɪŋk ɪn ˈsʌmwʌnz ˈɑːmər/
UK /tʃɪŋk ɪn ˈsʌmwʌnz ˈɑːmər/

1.
약점, 취약점
a weakness or vulnerability in someone or something that is otherwise strong or well-protected
:
•
The prosecutor found a chink in the defendant's armor during cross-examination.
검사는 반대 심문 중에 피고인의 약점을 발견했다.
•
Despite his confident exterior, there was a chink in his armor when it came to public speaking.
자신감 있는 겉모습에도 불구하고, 대중 연설에 있어서는 그의 약점이 있었다.