"swan upping" meaning in English

{
  "forms": [
    {
      "form": "swan uppings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
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      "expansion": "swan upping (countable and uncountable, plural swan uppings)",
      "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"
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          "source": "w"
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          "parents": [
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          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Swans",
          "orig": "en:Swans",
          "parents": [
            "Anatids",
            "Freshwater birds",
            "Birds",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An annual swan census in Britain in which mute swans on the River Thames are rounded up, caught, marked, and released."
      ],
      "id": "en-swan_upping-en-noun-5pFwUYmi",
      "links": [
        [
          "swan",
          "swan"
        ],
        [
          "census",
          "census"
        ],
        [
          "Britain",
          "Britain"
        ],
        [
          "mute swan",
          "mute swan"
        ],
        [
          "Thames",
          "Thames"
        ]
      ],
      "related": [
        {
          "word": "swan upper"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "swan upping"
      ]
    }
  ],
  "word": "swan upping"
}

{
  "forms": [
    {
      "form": "swan uppings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "swan upping (countable and uncountable, plural swan uppings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "swan upper"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
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        "English uncountable nouns",
        "en:Swans"
      ],
      "glosses": [
        "An annual swan census in Britain in which mute swans on the River Thames are rounded up, caught, marked, and released."
      ],
      "links": [
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          "swan"
        ],
        [
          "census",
          "census"
        ],
        [
          "Britain",
          "Britain"
        ],
        [
          "mute swan",
          "mute swan"
        ],
        [
          "Thames",
          "Thames"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "swan upping"
      ]
    }
  ],
  "word": "swan upping"
}