"stag do" meaning in English

{
  "etymology_text": "From stag + do (“party”), alteration of stag party.",
  "forms": [
    {
      "form": "stag dos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "stag do (plural stag dos)",
      "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": "2018, The Telegraph: Duke of Cambridge arrives at the Royal Wedding with Prince Harry:",
          "text": "The Duke’s own stag do is reported to have been held on a Devon estate, Hartland Abbey, where he and close friends indulged in drinking, clay pigeon shooting, surfing and games.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A stag party."
      ],
      "id": "en-stag_do-en-noun-MJ0oELyI",
      "links": [
        [
          "stag party",
          "stag party"
        ]
      ],
      "raw_glosses": [
        "(UK) A stag party."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "stag do"
}

{
  "etymology_text": "From stag + do (“party”), alteration of stag party.",
  "forms": [
    {
      "form": "stag dos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "stag do (plural stag dos)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "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"
      ],
      "examples": [
        {
          "ref": "2018, The Telegraph: Duke of Cambridge arrives at the Royal Wedding with Prince Harry:",
          "text": "The Duke’s own stag do is reported to have been held on a Devon estate, Hartland Abbey, where he and close friends indulged in drinking, clay pigeon shooting, surfing and games.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A stag party."
      ],
      "links": [
        [
          "stag party",
          "stag party"
        ]
      ],
      "raw_glosses": [
        "(UK) A stag party."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "stag do"
}