"shotgun double" meaning in English

{
  "forms": [
    {
      "form": "shotgun doubles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shotgun double (plural shotgun doubles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2005, Chris Rose, 1 Dead in Attic, Simon & Schuster, published 2015, page 11:",
          "text": "I saw a dead guy on the front porch of a shotgun double on a working-class street, and the only sound was wind chimes.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Two shotgun houses which share a central wall."
      ],
      "id": "en-shotgun_double-en-noun-jlFQEViZ",
      "links": [
        [
          "shotgun house",
          "shotgun house"
        ]
      ],
      "raw_glosses": [
        "(US) Two shotgun houses which share a central wall."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "shotgun double"
}

{
  "forms": [
    {
      "form": "shotgun doubles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shotgun double (plural shotgun doubles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2005, Chris Rose, 1 Dead in Attic, Simon & Schuster, published 2015, page 11:",
          "text": "I saw a dead guy on the front porch of a shotgun double on a working-class street, and the only sound was wind chimes.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Two shotgun houses which share a central wall."
      ],
      "links": [
        [
          "shotgun house",
          "shotgun house"
        ]
      ],
      "raw_glosses": [
        "(US) Two shotgun houses which share a central wall."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "shotgun double"
}