1. the act of being disloyal to someone who trusts you
2. the act of revealing secret information to an enemy or opponent

Examples

• She felt a deep sense of betrayal when her best friend shared her secret.
• The spy’s betrayal of his country led to his imprisonment.
• His betrayal of the team’s trust cost them the championship.
• The betrayal by her business partner left her financially ruined.
• Many considered his actions a betrayal of democratic principles.
• The novel explores themes of love, loyalty, and betrayal.