"cat's meat" meaning in English

{
  "etymology_text": "Animals' lungs used to be sold as food for cats.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "cat's meat (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1821, J. Burrowes, Life in St George's Fields:",
          "text": "You must let him have all the jaw-work to himself, and give a holiday to your cat's meat.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A person's lungs."
      ],
      "id": "en-cat's_meat-en-noun-gOMYnsDA",
      "links": [
        [
          "lung",
          "lung"
        ]
      ],
      "raw_glosses": [
        "(UK, obsolete, slang) A person's lungs."
      ],
      "related": [
        {
          "word": "cat meat"
        }
      ],
      "tags": [
        "UK",
        "obsolete",
        "slang",
        "uncountable"
      ]
    }
  ],
  "word": "cat's meat"
}

{
  "etymology_text": "Animals' lungs used to be sold as food for cats.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "cat's meat (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "cat meat"
    }
  ],
  "senses": [
    {
      "categories": [
        "British English",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with obsolete senses",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1821, J. Burrowes, Life in St George's Fields:",
          "text": "You must let him have all the jaw-work to himself, and give a holiday to your cat's meat.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A person's lungs."
      ],
      "links": [
        [
          "lung",
          "lung"
        ]
      ],
      "raw_glosses": [
        "(UK, obsolete, slang) A person's lungs."
      ],
      "tags": [
        "UK",
        "obsolete",
        "slang",
        "uncountable"
      ]
    }
  ],
  "word": "cat's meat"
}