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

1.
弱點, 漏洞
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.
檢察官在交叉詢問中發現了被告的弱點。
•
Despite his confident exterior, there was a chink in his armor when it came to public speaking.
儘管他外表自信,但在公開演講方面卻有弱點。