traitor

Etymology

From Middle English traitor, traitour, traytour, from Old French traïtor (French traître), from Latin trāditor. Displaced native Middle English swike from Old English swica (“traitor”), and Middle English proditour and traditour borrowed directly from Latin. The general Old English word denoting "traitor" was lǣwa or lǣwend.

noun

1. Someone who violates an allegiance and betrays their country; someone guilty of treason; one who, in breach of trust, delivers their country to an enemy, or yields up any fort or place entrusted to their defense, or surrenders an army or body of troops to the enemy, unless when vanquished.
   Yes, that was Vice President Spiro Agnew commemorating the "loyalty" of literal traitors. But what can you really expect from a man whose name rearranged spells "grow a penis." Oct 8 2017, “Confederacy” (14:45 from the start), in Last Week Tonight with John Oliver, season 4, episode 26, John Oliver (actor), via HBO
2. Someone who takes arms and levies war against their country; or one who aids an enemy in conquering their country.
3. (by extension) One who betrays any confidence or trust.
   It took you two weeks To go off and date her Guess you didn't cheat But you're still, you're still a traitor Yeah, you're still a traitor 2021, Olivia Rodrigo, Dan Nigro (lyrics and music), “Traitor”, in Sour, performed by Olivia Rodrigo

verb

1. To act the traitor toward; to betray; to deceive.

adj

1. Traitorous.