"blind quote" meaning in English

{
  "forms": [
    {
      "form": "blind quotes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blind quote (plural blind quotes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1989, Greil Marcus, “The Attack on Charlie Chaplin”, in Lipstick Traces, Faber & Faber, published 2009",
          "text": "There is a key line from Wolman that Isou must have missed (“And their revolts were turning into acts of conformity”); blind quotes from John Ford's Rio Grande and from Saint-Just (“Happiness is a new idea in Europe”).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A statement from an anonymous or unattributed source."
      ],
      "id": "en-blind_quote-en-noun-YSBKqeHX",
      "links": [
        [
          "statement",
          "statement"
        ],
        [
          "anonymous",
          "anonymous"
        ],
        [
          "unattributed",
          "unattributed"
        ],
        [
          "source",
          "source"
        ]
      ]
    }
  ],
  "word": "blind quote"
}

{
  "forms": [
    {
      "form": "blind quotes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blind quote (plural blind quotes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1989, Greil Marcus, “The Attack on Charlie Chaplin”, in Lipstick Traces, Faber & Faber, published 2009",
          "text": "There is a key line from Wolman that Isou must have missed (“And their revolts were turning into acts of conformity”); blind quotes from John Ford's Rio Grande and from Saint-Just (“Happiness is a new idea in Europe”).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A statement from an anonymous or unattributed source."
      ],
      "links": [
        [
          "statement",
          "statement"
        ],
        [
          "anonymous",
          "anonymous"
        ],
        [
          "unattributed",
          "unattributed"
        ],
        [
          "source",
          "source"
        ]
      ]
    }
  ],
  "word": "blind quote"
}