treason

Definitions

The crime of betraying one's country, especially by attempting to kill the sovereign or overthrow the government.

The action of betraying someone or something; treachery.

Examples

The general was arrested and charged with treason for selling state secrets to the enemy.

Betraying your country during a time of war is considered the ultimate act of treason.

Synonyms

betrayal sedition disloyalty treachery perfidy subversion insurrection

Antonyms

allegiance loyalty fidelity faithfulness devotion patriotism constancy