1. to no longer be trusted or believed by others; to have one's reputation for honesty, competence, or reliability damaged
The politician lost credibility after the scandal was revealed.
O político perdeu credibilidade após o escândalo ser revelado.
2. to become unreliable or unconvincing in the eyes of the public or a specific audience
If you keep making excuses, you will lose credibility with your team.
Se você continuar inventando desculpas, perderá credibilidade com sua equipe.