/ ˈkwɪzlɪŋ; NAmE / noun
( disapproving ) a person who helps an enemy that has taken control of his or her country
SYN collaborator
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WORD ORIGIN
Second World War: from the name of Major Vidkun Quisling (1887–1945), the Norwegian army officer and diplomat who ruled Norway on behalf of the German occupying forces (1940–45).