betrayer
nounUK /bɪˈtreɪ.ər/
US /bɪˈtreɪ.ɚ/
A person who breaks a promise to a friend and hurts them.
The knight was called a betrayer after he told the enemy the castle's secret.
RELATED WORDS
OTHER MEANINGS
2. A person who gives away secret information about their own group to an enemy.
The spy was a betrayer who sold army plans to the other side.
3. A person who is not faithful to a cause or belief they once supported.
He was seen as a betrayer of the movement he once led.
4. A person who reveals or exposes something hidden, often harmfully.
She felt like a betrayer when she told the teacher about her friend's plan.