Norwegian Bokmål Etymology From land + -s- + sviker. Noun landssviker m (definite singular landssvikeren, indefinite plural landssvikere, definite plural landssvikerne) a traitor, quisling (within Norway) Synonyms: landsforræder, quisling See also landssvikar (Nynorsk) References “landssviker” in The Bokmål Dictionary.Wikiwand - on Seamless Wikipedia browsing. On steroids.