trai·tor /ˈtreɪtə $ -ər/ ●○○ noun [countableC, uncountableU] BETRAYsomeone who is not loyal to their country, friends, or beliefs 卖国者;叛徒,背叛者 → treasontraitor to a traitor to the cause of women’s rights 女权事业的背叛者
a politician who turned traitor (=became a traitor) to the government 背叛政府的政客
traitor to• a traitor to the country