"trap door" meaning in English

{
  "forms": [
    {
      "form": "trap doors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "trap door (plural trap doors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "trapdoor"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1960 September, “Inter-city diesel units for the Hull-Liverpool service of the N.E.R.”, in Trains Illustrated, pages 559–560",
          "text": "Trap doors are provided at various places in the floor to facilitate inspection and maintenance of the diesel equipment.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of trapdoor"
      ],
      "id": "en-trap_door-en-noun-BnKQHm8a",
      "links": [
        [
          "trapdoor",
          "trapdoor#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "trap door"
}

{
  "forms": [
    {
      "form": "trap doors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "trap door (plural trap doors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "trapdoor"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1960 September, “Inter-city diesel units for the Hull-Liverpool service of the N.E.R.”, in Trains Illustrated, pages 559–560",
          "text": "Trap doors are provided at various places in the floor to facilitate inspection and maintenance of the diesel equipment.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of trapdoor"
      ],
      "links": [
        [
          "trapdoor",
          "trapdoor#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "trap door"
}