treason
nounUK /ˈtriː.zən/
US /ˈtriː.zən/
The crime of being disloyal to your own country, especially by helping its enemies.
The soldier was accused of treason for giving secrets to the enemy.
RELATED WORDS
OTHER MEANINGS
2. A betrayal of trust in a person or group you should be loyal to.
Some fans called his move to the rival team an act of treason.
3. In law, the specific crime of trying to overthrow the government or harm the ruler.
The old law punished treason with the most severe penalty.
4. Any act of great disloyalty to a cause or organization.
Leaking the club's plans was seen as treason by the members.