"opium den" meaning in English

{
  "forms": [
    {
      "form": "opium dens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "opium den (plural opium dens)",
      "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": "2023 September 6, Greg Morse, “One more for the road?”, in RAIL, number 991, pages 49-50",
          "text": "The pub was a classic 1930s 'roadhouse'. To the railway's official mindset, it might as well have been an opium den in Victorian London.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An establishment in which opium was sold and smoked."
      ],
      "id": "en-opium_den-en-noun-bK6FlGG4",
      "links": [
        [
          "establishment",
          "establishment"
        ]
      ],
      "raw_glosses": [
        "(historical) An establishment in which opium was sold and smoked."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "opium den"
}

{
  "forms": [
    {
      "form": "opium dens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "opium den (plural opium dens)",
      "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 historical senses",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2023 September 6, Greg Morse, “One more for the road?”, in RAIL, number 991, pages 49-50",
          "text": "The pub was a classic 1930s 'roadhouse'. To the railway's official mindset, it might as well have been an opium den in Victorian London.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An establishment in which opium was sold and smoked."
      ],
      "links": [
        [
          "establishment",
          "establishment"
        ]
      ],
      "raw_glosses": [
        "(historical) An establishment in which opium was sold and smoked."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "opium den"
}