a person who betrays his or her own country by aiding an invading enemy, often serving later in a puppet government; fifth columnist.

1940; after Vidkun Quisling (1887–1945), pro-Nazi Norwegian leader

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World English Dictionary
quisling (ˈkwɪzlɪŋ)
a traitor who aids an occupying enemy force; collaborator
[C20: after Major Vidkun Quisling (1887--1945), Norwegian collaborator with the Nazis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1940, from Vidkun Quisling (1887-1945), Norwegian fascist politician who headed the puppet government during the Ger. occupation of Norway in World War II; shot for treason after Ger. defeat. First used in London "Times" of April 15, 1940, in a Swed. context.
Online Etymology Dictionary, © 2010 Douglas Harper
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