From Longman Dictionary of Contemporary Englishtraitortrai‧tor /ˈtreɪtə $ -ər/●くろまる○しろまる○しろまる noun [countable, uncountable]BETRAYsomeone who is not loyal to their country, friends, or beliefs → treasontraitor toa traitor to the cause of women’s rightsa politician who turned traitor (=became a traitor) to the governmentExamples from the Corpustraitor• At the end of the war Mata Hari was hanged as a traitor.• A body could also be a traitor, indulgingurgesalien to intellect and emotion.• Nobody's suggesting he is a traitor, he's one of our very best men.• His fathersuffered even more when the revolutionariesdecided that he was a traitor and plundered his estateworth ten thousand pounds.• Yet in the first autumn of the war he seemed neither a famoustraitor nor an infamous war criminal.• Whether she is victim or traitor remains unknown.• Zaragoza turned traitor when he thought the Republicans would lose the war.• Frequently they were outspoken wives, who were considered monstrousshrews or unnaturaltraitors to their husbands.• For that's the place where traitors ought to be.traitor to• a traitor to the countryOrigintraitor(1200-1300)Old Frenchtraitre, from Latintraditor, from tradere"to hand over, deliver, betray", from trans- ( → TRANS-) + dare"to give"