"self-sucker" meaning in English

{
  "forms": [
    {
      "form": "self-suckers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "self-sucker (plural self-suckers)",
      "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"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Female animals",
          "orig": "en:Female animals",
          "parents": [
            "Animals",
            "Female",
            "Lifeforms",
            "Gender",
            "All topics",
            "Life",
            "Biology",
            "Psychology",
            "Sociology",
            "Fundamental",
            "Nature",
            "Sciences",
            "Social sciences",
            "Society"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1886, The American Agriculturist, volume 45, page 54:",
          "text": "It is worth while, therefore, to treat the self-suckers while they are giving milk.",
          "type": "quote"
        },
        {
          "ref": "1901, The Agricultural Journal of the Cape of Good Hope, volume 18, page 31:",
          "text": "It is generally the best cows that are self-suckers, the habit being due to the extreme pressure of milk causing pain.",
          "type": "quote"
        },
        {
          "ref": "1913, The Breeder's Gazette, Farm Buildings, page 310:",
          "text": "Cows addicted to the habit of sucking themselves should be taken in hand as soon as they are known to be self-suckers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A female farm animal which drinks its own milk."
      ],
      "id": "en-self-sucker-en-noun-SVzjETT0",
      "links": [
        [
          "farm animal",
          "farm animal"
        ],
        [
          "milk",
          "milk"
        ]
      ],
      "raw_glosses": [
        "(dated) A female farm animal which drinks its own milk."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "self-sucker"
}

{
  "forms": [
    {
      "form": "self-suckers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "self-sucker (plural self-suckers)",
      "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",
        "Quotation templates to be cleaned",
        "en:Female animals"
      ],
      "examples": [
        {
          "ref": "1886, The American Agriculturist, volume 45, page 54:",
          "text": "It is worth while, therefore, to treat the self-suckers while they are giving milk.",
          "type": "quote"
        },
        {
          "ref": "1901, The Agricultural Journal of the Cape of Good Hope, volume 18, page 31:",
          "text": "It is generally the best cows that are self-suckers, the habit being due to the extreme pressure of milk causing pain.",
          "type": "quote"
        },
        {
          "ref": "1913, The Breeder's Gazette, Farm Buildings, page 310:",
          "text": "Cows addicted to the habit of sucking themselves should be taken in hand as soon as they are known to be self-suckers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A female farm animal which drinks its own milk."
      ],
      "links": [
        [
          "farm animal",
          "farm animal"
        ],
        [
          "milk",
          "milk"
        ]
      ],
      "raw_glosses": [
        "(dated) A female farm animal which drinks its own milk."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "self-sucker"
}