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quisling (n.)

"national traitor," especially during World War II in Nazi-occupied countries, "collaborationist," 1940, from Vidkun Quisling (1887-1945), Norwegian fascist politician who headed the puppet government during the German occupation of Norway in World War II; shot for treason after the German defeat. First used in London Times of April 15, 1940, in a Swedish context.

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Definitions of quisling from WordNet

quisling (n.)
someone who collaborates with an enemy occupying force;
Synonyms: collaborator / collaborationist
From wordnet.princeton.edu