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English Lexicon

Fifth column

/ˌfɪfθ ˈkɒl.əm/
nounCEFR C2 (Proficient)Top #15400 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A clandestine group or faction of subversive sympathizers who operate within a nation or organization to secretly aid an enemy force.

    "Counterintelligence units worked tirelessly to uncover a suspected fifth column operating within the government."
  2. 2

    Any group of people who clandestinely undermine a larger group, such as a nation or political party, from within.

    "The corporate leadership worried that a disgruntled faction inside the engineering department might act as a fifth column for their chief rival."
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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Originating during the Spanish Civil War around 1936, the term was coined by Nationalist General Emilio Mola, who stated that while his four columns of troops were attacking Madrid, a 'fifth column' of hidden sympathizers inside the city would rise up to aid them. The expression quickly entered international journalism and political lexicon to denote any clandestine group acting as subversives within a nation.

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