treason
//ˈtriː.zən//
Noun
treasonSingular
treasonsPlural
1
The crime of betraying one's country, especially by attempting to kill or overthrow the sovereign or government.
He was charged with treason for selling military secrets to a foreign country.
2
The action of betraying someone or something; treachery or disloyalty.
She felt that his lies were a form of treason against their friendship.