The story
Back-formation from quisling.
First known use, by meaning
- especially in the 1940s To collaborate with an (occupying) enemy power; be a quisling.
Etymology from Wiktionary, CC BY-SA 4.0.
quisle
Today it means: To collaborate with an (occupying) enemy power; be a quisling. Full definition →
First used especially in the 1940s