"blue room" meaning in English

{
  "forms": [
    {
      "form": "blue rooms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue room (plural blue rooms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "74 26",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "68 32",
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "75 25",
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "57 43",
          "kind": "topical",
          "langcode": "en",
          "name": "Rooms",
          "orig": "en:Rooms",
          "parents": [
            "Buildings and structures",
            "Architecture",
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "In cinema, a room with blue (or occasionally green) walls in which effects shots are filmed."
      ],
      "id": "en-blue_room-en-noun-55wFo3zf",
      "links": [
        [
          "cinema",
          "cinema"
        ],
        [
          "blue",
          "blue"
        ],
        [
          "effect",
          "effect"
        ],
        [
          "shot",
          "shot"
        ]
      ],
      "related": [
        {
          "_dis1": "84 16",
          "word": "green room"
        }
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Aviation",
          "orig": "en:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1980, Robert J. Serling, From the captain to the colonel, page 423",
          "text": "Phyllis Ash was working a flight where the smooth routine was suddenly interrupted by a ten-year-old boy who went to the \"blue room\" (toilet) and proceeded to get his penis stuck in his zipper.",
          "type": "quotation"
        },
        {
          "ref": "2019, Colin C. Law, A Flight Attendant's Essential Guide, page 4",
          "text": "[…] they intended to use the “blue room”, or lavatory.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The toilet/washroom on a passenger aircraft."
      ],
      "id": "en-blue_room-en-noun-Vme5dDYo",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "toilet",
          "toilet"
        ],
        [
          "washroom",
          "washroom"
        ],
        [
          "passenger",
          "passenger"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation, slang) The toilet/washroom on a passenger aircraft."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "blue room"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English entries with topic categories using raw markup",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms with non-redundant non-automated sortkeys",
    "en:Rooms"
  ],
  "forms": [
    {
      "form": "blue rooms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue room (plural blue rooms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "green room"
    }
  ],
  "senses": [
    {
      "glosses": [
        "In cinema, a room with blue (or occasionally green) walls in which effects shots are filmed."
      ],
      "links": [
        [
          "cinema",
          "cinema"
        ],
        [
          "blue",
          "blue"
        ],
        [
          "effect",
          "effect"
        ],
        [
          "shot",
          "shot"
        ]
      ]
    },
    {
      "categories": [
        "English slang",
        "English terms with quotations",
        "Quotation templates to be cleaned",
        "en:Aviation"
      ],
      "examples": [
        {
          "ref": "1980, Robert J. Serling, From the captain to the colonel, page 423",
          "text": "Phyllis Ash was working a flight where the smooth routine was suddenly interrupted by a ten-year-old boy who went to the \"blue room\" (toilet) and proceeded to get his penis stuck in his zipper.",
          "type": "quotation"
        },
        {
          "ref": "2019, Colin C. Law, A Flight Attendant's Essential Guide, page 4",
          "text": "[…] they intended to use the “blue room”, or lavatory.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The toilet/washroom on a passenger aircraft."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "toilet",
          "toilet"
        ],
        [
          "washroom",
          "washroom"
        ],
        [
          "passenger",
          "passenger"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(aviation, slang) The toilet/washroom on a passenger aircraft."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "blue room"
}