1. to stop believing in or relying on someone's honesty, reliability, or integrity
After he lied to me, I lost trust in him completely.
Depois que ele mentiu para mim, perdi completamente a confiança nele.
2. to cease having confidence in an institution, organization, or system
Many citizens lost trust in the government after the scandal.
Muitos cidadãos perderam a confiança no governo após o escândalo.