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English definition of “traitor”

traitor

noun [C]  /ˈtreɪ·t̬ər/ us  
a person who gives away or sells secrets of his or her country, or someone who is not loyal to particular beliefs or friends: Benedict Arnold was a traitor during the American Revolution. Opponents called the mayor "a traitor to the cause."
(Definition of traitor from the Cambridge Academic Content Dictionary © Cambridge University Press)
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