An act of betraying someone means breaking their trust or doing something that hurts them.
When we say someone is betraying another person, it usually means they did something wrong to hurt their friend, family member, or partner. This can be a big deal and might even end relationships. For example, if your best friend shares a secret with someone else behind your back, you could feel betrayed. Betrayal often happens when people's trust is broken in some way - maybe someone lies to us, cheats on us, or steals something that belongs to us. It can be a really painful feeling and might take a long time to heal from.
To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly.
Example: an officer betrayed the city
Betrayal
