"三連単" meaning in Japanese

{
  "forms": [
    {
      "form": "三連単",
      "ruby": [
        [
          "三",
          "さん"
        ],
        [
          "連",
          "れん"
        ],
        [
          "単",
          "たん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sanrentan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "さんれんたん",
      "roman": "sanrentan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さんれんたん",
        "hhira": "さんれんたん"
      },
      "expansion": "三(さん)連(れん)単(たん) • (sanrentan) ^(←さんれんたん (sanrentan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 3 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "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": "ja",
          "name": "Horse racing",
          "orig": "ja:Horse racing",
          "parents": [
            "Equestrianism",
            "Horses",
            "Animal riding",
            "Sports",
            "Equids",
            "Livestock",
            "Transport",
            "Human activity",
            "Odd-toed ungulates",
            "Agriculture",
            "Animals",
            "All topics",
            "Human behaviour",
            "Mammals",
            "Applied sciences",
            "Lifeforms",
            "Fundamental",
            "Human",
            "Vertebrates",
            "Sciences",
            "Life",
            "Chordates",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "roman": "sanrenfuku",
          "ruby": [
            [
              "三連複",
              "さんれんふく"
            ]
          ],
          "word": "三連複"
        }
      ],
      "glosses": [
        "betting on the first 3 winning horses, in order"
      ],
      "id": "en-三連単-ja-noun-9rS29nXQ",
      "links": [
        [
          "horse racing",
          "horse racing"
        ],
        [
          "betting",
          "betting"
        ]
      ],
      "raw_glosses": [
        "(horse racing) betting on the first 3 winning horses, in order"
      ],
      "topics": [
        "hobbies",
        "horse-racing",
        "horseracing",
        "horses",
        "lifestyle",
        "pets",
        "racing",
        "sports"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sã̠n̺ɾẽ̞ntã̠ɴ]"
    }
  ],
  "word": "三連単"
}

{
  "coordinate_terms": [
    {
      "roman": "sanrenfuku",
      "ruby": [
        [
          "三連複",
          "さんれんふく"
        ]
      ],
      "word": "三連複"
    }
  ],
  "forms": [
    {
      "form": "三連単",
      "ruby": [
        [
          "三",
          "さん"
        ],
        [
          "連",
          "れん"
        ],
        [
          "単",
          "たん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sanrentan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "さんれんたん",
      "roman": "sanrentan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さんれんたん",
        "hhira": "さんれんたん"
      },
      "expansion": "三(さん)連(れん)単(たん) • (sanrentan) ^(←さんれんたん (sanrentan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms with 3 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation missing pitch accent",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Horse racing"
      ],
      "glosses": [
        "betting on the first 3 winning horses, in order"
      ],
      "links": [
        [
          "horse racing",
          "horse racing"
        ],
        [
          "betting",
          "betting"
        ]
      ],
      "raw_glosses": [
        "(horse racing) betting on the first 3 winning horses, in order"
      ],
      "topics": [
        "hobbies",
        "horse-racing",
        "horseracing",
        "horses",
        "lifestyle",
        "pets",
        "racing",
        "sports"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sã̠n̺ɾẽ̞ntã̠ɴ]"
    }
  ],
  "word": "三連単"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <span> not properly closed",
  "path": [
    "三連単"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "三連単",
  "trace": "started on line 2, detected on line 2"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "三連単"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "三連単",
  "trace": ""
}