DictionaryquislingCollaborator with an occupying enemy
noun

quisling

KWIZ-ling/ˈkwɪzlɪŋ/

A traitor who helps an enemy occupying the traitor's country.

The quisling helps the occupying army identify members of the resistance.

In occupied Norway during World War II, a local civilian collaborator opens a concealed cellar hatch and points out hiding compatriots to armed German occupation soldiers.
Etymology

Quisling's surname became a label for an enemy collaborator because he headed Norway's puppet government during the German occupation. The personal name thus became a general term for this kind of traitor.

In context

World History19:10
owing to his collaboration with Nazi Germany. Outside of Norway, the word “quisling” has outlasted the memory of Vidkun Quisling himself and became synonymous with “traitor,” a use that began during the war.
Execution of Vidkun Quisling - History's Most Infamous Traitor who Sold his Country to the Nazis

More examples

  • Villagers call the mayor a quisling for helping the occupying troops.
  • After the occupation ends, several quislings face trial for treason.
  • She refuses to become a quisling by handing her neighbors over to the invaders.

Forms

quisling · quislings

Similar words

collaborator
Can mean an enemy helper, but also an ordinary coworker.
traitor
Covers betrayal generally, not just assistance to an occupying enemy.