"water gut" meaning in English

{
  "forms": [
    {
      "form": "water guts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "water gut (plural water guts)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1915 January, “The Horse: Outlines of Anatomy for First Aid”, in Journal of the Department of Agriculture, South Australia, page 515:",
          "text": "In this point of the water gut you will find an accumulation of sand, grit, &c., which are difficult to pass out.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A horse's caecum."
      ],
      "id": "en-water_gut-en-noun-Pv16D1q0",
      "links": [
        [
          "horse",
          "horse"
        ],
        [
          "caecum",
          "caecum"
        ]
      ],
      "raw_glosses": [
        "(dated) A horse's caecum."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "water gut"
}

{
  "forms": [
    {
      "form": "water guts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "water gut (plural water guts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English dated terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1915 January, “The Horse: Outlines of Anatomy for First Aid”, in Journal of the Department of Agriculture, South Australia, page 515:",
          "text": "In this point of the water gut you will find an accumulation of sand, grit, &c., which are difficult to pass out.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A horse's caecum."
      ],
      "links": [
        [
          "horse",
          "horse"
        ],
        [
          "caecum",
          "caecum"
        ]
      ],
      "raw_glosses": [
        "(dated) A horse's caecum."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "water gut"
}