Meaning of fever swamp in English:

fever swamp

Pronunciation /ˈfiːvə ˌswɒmp/

noun

  • 1Any swamp regarded as the source of an infectious fever or as a breeding ground for disease-carrying mosquitoes.

  • 2figurative A portion of the media, a political party, etc., in which political extremism originates or flourishes.

Origin

Mid 19th century. From fever + swamp.