"double file" meaning in English

{
  "forms": [
    {
      "form": "double files",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double file (plural double files)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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      "examples": [
        {
          "bold_text_offsets": [
            [
              23,
              34
            ]
          ],
          "ref": "1864, United States War Department, The 1864 Field Artillery Tactics, Stackpole Books, published 2005, →ISBN, page 120:",
          "text": "The column marching in double file, the instructor commands: […]",
          "type": "quote"
        },
        {
          "ref": "1891, Nettie D. Kimberlin, in Annual Report of the Controller of the City of Detroit of the Receipts and Expenditures of the Corporation, The Smith Printing Co., page 30",
          "text": "In marching by double file, four abreast, etc., elbows touch and no lagging should be allowed."
        },
        {
          "ref": "1942, Francis Ernest Lloyd, The Carnivorous Plants, READ BOOKS (publisher, 2007), page 100",
          "text": "There are three double files of stalked glands, one along each leaf margin, roughly speaking, and two rows along the under leaf surface, […]"
        }
      ],
      "glosses": [
        "A double line, especially, a queue two persons wide."
      ],
      "id": "en-double_file-en-noun-6Vtu4vUb",
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "double line",
          "word": "parijono"
        }
      ]
    }
  ],
  "word": "double file"
}

{
  "forms": [
    {
      "form": "double files",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double file (plural double files)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "examples": [
        {
          "bold_text_offsets": [
            [
              23,
              34
            ]
          ],
          "ref": "1864, United States War Department, The 1864 Field Artillery Tactics, Stackpole Books, published 2005, →ISBN, page 120:",
          "text": "The column marching in double file, the instructor commands: […]",
          "type": "quote"
        },
        {
          "ref": "1891, Nettie D. Kimberlin, in Annual Report of the Controller of the City of Detroit of the Receipts and Expenditures of the Corporation, The Smith Printing Co., page 30",
          "text": "In marching by double file, four abreast, etc., elbows touch and no lagging should be allowed."
        },
        {
          "ref": "1942, Francis Ernest Lloyd, The Carnivorous Plants, READ BOOKS (publisher, 2007), page 100",
          "text": "There are three double files of stalked glands, one along each leaf margin, roughly speaking, and two rows along the under leaf surface, […]"
        }
      ],
      "glosses": [
        "A double line, especially, a queue two persons wide."
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "double line",
      "word": "parijono"
    }
  ],
  "word": "double file"
}