"green lung" meaning in English

{
  "forms": [
    {
      "form": "green lungs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "green lung (plural green lungs)",
      "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": "2006, Christof Mauch, Nathan Stoltzfus, Douglas R. Weiner, Shades of green: environmental activism around the globe, page 76",
          "text": "The Magaliesberg became something of a green lung to which people escaped, particularly over weekends.",
          "type": "quotation"
        },
        {
          "ref": "2007, United Nations Environment Programme, Beijing 2008 Olympic games: an environmental review, page 74",
          "text": "After the Games, the Park will remain protected, serving as a green lung for the surrounding boroughs and the Olympic Village residential area.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An area of natural parkland within an urban region, supposed to replenish the air with oxygen."
      ],
      "id": "en-green_lung-en-noun-E-qDaBUW",
      "links": [
        [
          "natural",
          "natural"
        ],
        [
          "parkland",
          "parkland"
        ],
        [
          "urban",
          "urban"
        ],
        [
          "replenish",
          "replenish"
        ],
        [
          "oxygen",
          "oxygen"
        ]
      ]
    }
  ],
  "word": "green lung"
}

{
  "forms": [
    {
      "form": "green lungs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "green lung (plural green lungs)",
      "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",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2006, Christof Mauch, Nathan Stoltzfus, Douglas R. Weiner, Shades of green: environmental activism around the globe, page 76",
          "text": "The Magaliesberg became something of a green lung to which people escaped, particularly over weekends.",
          "type": "quotation"
        },
        {
          "ref": "2007, United Nations Environment Programme, Beijing 2008 Olympic games: an environmental review, page 74",
          "text": "After the Games, the Park will remain protected, serving as a green lung for the surrounding boroughs and the Olympic Village residential area.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An area of natural parkland within an urban region, supposed to replenish the air with oxygen."
      ],
      "links": [
        [
          "natural",
          "natural"
        ],
        [
          "parkland",
          "parkland"
        ],
        [
          "urban",
          "urban"
        ],
        [
          "replenish",
          "replenish"
        ],
        [
          "oxygen",
          "oxygen"
        ]
      ]
    }
  ],
  "word": "green lung"
}