1. revealing or exposing someone or something, especially secretly or unintentionally
Usage: present participle of betray
2. being disloyal to someone who trusts you
Usage: present participle of betray

Examples

• His nervous laughter was betraying his anxiety about the test.
• The spy was betraying his country by selling secrets to the enemy.
• She felt guilty about betraying her friend’s confidence.
• The footprints in the mud were betraying the intruder’s path.
• He accused his business partner of betraying their agreement.
• Her trembling hands were betraying her fear despite her calm voice.