quis·ling A traitor who serves as the puppet of the enemy occupying his or her country.
[After Vidkun Quisling (1887-1945), head of Norway's government during the Nazi occupation (1940-1945).]
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quisling [ˈkwɪzlɪŋ]
n (Military) a traitor who aids an occupying enemy force; collaborator
[after Major Vidkun Quisling (1887-1945), Norwegian collaborator with the Nazis]
Source: quisling