Quisling (/ˈkwɪzlɪŋ/; Norwegian pronunciation: [ˈkvɪ̂slɪŋ]) is a term originating in Norway, which is used in Scandinavian languages and in English for a person who collaborates with an enemy occupying force – or more generally as a synonym for traitor.[1][2][3] The word originates from the surname of the Norwegian war-time leader Vidkun Quisling, who headed a domestic Nazi collaborationist regime during World War II.