quisling - definition and synonyms

noun [countable] old-fashioned 

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/ˈkwɪzlɪŋ/
singularquisling
pluralquislings
  1. showing disapproval someone who secretly helps an enemy or opponent
     Synonyms and related words
Word story
From Vidkun Quisling, a Norwegian politician who helped the Nazis to take control of Norway during the Second World War.