English definition of “betray”
/bɪˈtreɪ/ verb [T]
PERSON › to behave in a dishonest or cruel way to someone who trusts you: When I heard what he had said about me, I felt betrayed.
SECRETS › If you betray your country or an organization, you give secret information to its enemies or to other organizations.
EMOTION › to show an emotion that you were trying to hide: Her face was calm, but her hands betrayed her nervousness.