sixth column

noun
1.
the persons residing in a country at war who are devoted to aiding the fifth column in its activities, especially by lowering morale, spreading rumors, etc.
2.
the persons residing in a country at war who are devoted to blocking the efforts of the fifth column.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The fifth column shows maximum local sales tax rates, and the sixth column
  shows local lodging tax rates.
The manner in which the controlled substance is supplied must be entered in the
  sixth column.
The vessel was placed in the last row of the sixth column of the convoy.
The sixth column automatically computes the day on which the initial indemnity
  check was mailed.
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