1. (n.) One who violates his allegiance and betrays his country; one guilty of treason; one who, in breach of trust, delivers his country to an enemy, or yields up any fort or place entrusted to his defense, or surrenders an army or body of troops to the enemy, unless when vanquished; also, one who takes arms and levies war against his country; or one who aids an enemy in conquering his country. See Treason.

2. (n.) Hence, one who betrays any confidence or trust; a betrayer.

3. (a.) Traitorous.

4. (v. t.) To act the traitor toward; to betray; to deceive.

Benedict Arnold Brutus Judas Judas Iscariot Quisling agitator apostate archtraitor backslider betrayer bolter brawler cockatrice collaborationist collaborator conniver conspirator conspirer convert convict criminal crook deceiver defector deserter desperado desperate criminal double agent double-crosser double-dealer extremist felon fifth columnist frondeur fugitive gallows bird gangster gaolbird informer insubordinate insurgent insurrectionary insurrectionist insurrecto intrigant intriguer jailbird lawbreaker machinator malcontent maverick mobster mugwump mutineer nonconformist outlaw plotter proselyte public enemy quisling racketeer rat rebel recidivist recreant renegade renegado renegate reversionist revolter revolutionary revolutionist rioter runagate schemer schismatic scofflaw scoundrel seceder secessionist separatist serpent snake strikebreaker subversive swindler tergiversant tergiversator thief thug timeserver treasonist trimmer turnabout turncoat turntail two-timer