"ventilating shaft" meaning in English

{
  "forms": [
    {
      "form": "ventilating shafts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ventilating shaft (plural ventilating shafts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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          "source": "w"
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          "source": "w"
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      "examples": [
        {
          "bold_text_offsets": [
            [
              110,
              128
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          "ref": "1957 June 23, “Relining Dove Holes Tunnel”, in Railway Magazine, page 423:",
          "text": "The tunnel was constructed about eighty years ago, and is 1 mile 1,224 yd. long, […] There are eight existing ventilating shafts varying in diameter from 8 to 10 ft. and in depth from 52 to 336 ft.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of ventilation shaft."
      ],
      "id": "en-ventilating_shaft-en-noun-ZcDFDno6",
      "links": [
        [
          "ventilation shaft",
          "ventilation shaft#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
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          "word": "ventilation shaft"
        }
      ]
    }
  ],
  "word": "ventilating shaft"
}

{
  "forms": [
    {
      "form": "ventilating shafts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ventilating shaft (plural ventilating shafts)",
      "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",
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      "examples": [
        {
          "bold_text_offsets": [
            [
              110,
              128
            ]
          ],
          "ref": "1957 June 23, “Relining Dove Holes Tunnel”, in Railway Magazine, page 423:",
          "text": "The tunnel was constructed about eighty years ago, and is 1 mile 1,224 yd. long, […] There are eight existing ventilating shafts varying in diameter from 8 to 10 ft. and in depth from 52 to 336 ft.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of ventilation shaft."
      ],
      "links": [
        [
          "ventilation shaft",
          "ventilation shaft#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
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          "word": "ventilation shaft"
        }
      ]
    }
  ],
  "word": "ventilating shaft"
}