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traitor

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traitor
traitor /ˈtreɪtə $ -ər/ noun [uncountable and countable]
 Date: 1200-1300
 Language: Old French
 Origin: traitre, from Latin traditor, from tradere 'to hand over, deliver, betray', from trans- ( trans-) + dare 'to give'
someone who is not loyal to their country, friends, or beliefs ⇨ treason
    traitor to
    a traitor to the cause of women’s rights
    a politician who turned traitor (=became a traitor) to the government