traitor/ˈtreɪtə(r); `tretɚ/ n~ (to sb/sth)1 person who betrays a friend, his country, a cause, etc 背叛者; 卖国贼; 叛徒 He's a traitor to himself, ie has acted against his own principles. 他背叛了自己的信条.2 (idm 习语) ,turn `traitor become a traitor 成为叛徒.
牛津英汉双解词典