1. A weakness or vulnerability in someone's character, argument, or defense that can be exploited
Despite his confident presentation, there was a chink in the armor when he couldn't answer the technical question.
Apesar de sua apresentação confiante, havia um ponto fraco quando ele não conseguiu responder à pergunta técnica.
2. A small opening or gap that compromises otherwise strong protection or defense
The company's security system had a chink in the armor that hackers exploited.
O sistema de segurança da empresa tinha uma brecha na armadura que os hackers exploraram.