Meaning

2 senses
  1. An additional group, beyond an identified fifth column, of people which clandestinely undermines a larger group, such as a nation, to which it is expected to be loyal.

  2. Used other than figuratively or idiomatically: see sixth, column.

Origin

Extension of fifth column.

Extension of fifth column.

Wiktionary, CC BY-SA 4.0 · source

Forms

plural: sixth columns
Singularsixth column
Pluralsixth columns

regular

See also

neighbours in the dictionary
sixth column — meaning, examples, forms, synonyms | Krumeto