Meaning of fifth columnist in English:

fifth columnist

Pronunciation /ˌfɪfθ ˈkɒləmnɪst/

noun

See fifth column

‘Insurrectionists, traitors and fifth columnists were a feature of our political landscape.’
  • ‘One of the main themes is the threat posed by fifth columnists, and Fred, despite his admirable single-mindedness, is dangerously naïve in his dealings with strangers.’
  • ‘Does Ms. West not think such fifth columnists exist?’
  • ‘The film contains an imaginary radio broadcast in which listeners are alerted to be on the lookout for fifth columnists.’
  • ‘Some opposition politicians and businessmen are also taking on the role of the fifth columnists.’