sixth column

noun

Definition of sixth column

1 : the aggregate of persons in a country at war who assist the subversive activities of the fifth column by defeatist talk, the spreading of rumors, and other activities that weaken resistance or appease the enemy
2 : a group organized to combat the fifth column

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“Sixth column.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sixth%20column. Accessed 24 Oct. 2020.

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