"閑話休題" meaning in Japanese

{
  "forms": [
    {
      "form": "閑話休題",
      "ruby": [
        [
          "閑",
          "かん"
        ],
        [
          "話",
          "わ"
        ],
        [
          "休",
          "きゅう"
        ],
        [
          "題",
          "だい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kanwa-kyūdai",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kan'wakiudai",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "かんわきうだい",
      "roman": "kan'wakiudai",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "かんわ-きゅうだい",
        "head": "閑話休題",
        "hhira": "かんわきうだい"
      },
      "expansion": "閑(かん)話(わ)休(きゅう)題(だい) • (kanwa-kyūdai) ^(←かんわきうだい (kan'wakiudai)?)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "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 redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "setting idle chatter aside and returning to the main topic"
      ],
      "id": "en-閑話休題-ja-intj-LgDGrFiy",
      "links": [
        [
          "setting",
          "set aside"
        ],
        [
          "idle",
          "idle"
        ],
        [
          "chatter",
          "chatter"
        ],
        [
          "aside",
          "set aside"
        ],
        [
          "main",
          "main"
        ],
        [
          "topic",
          "topic"
        ]
      ],
      "related": [
        {
          "english": "main topic",
          "roman": "honsuji",
          "ruby": [
            [
              "本筋",
              "ほんすじ"
            ]
          ],
          "word": "本筋"
        }
      ]
    }
  ],
  "sounds": [
    {
      "other": "かんわきゅうだい"
    },
    {
      "ipa": "[kã̠ɰ̃ɰᵝa̠kʲɨᵝːda̠i]"
    }
  ],
  "word": "閑話休題"
}

{
  "forms": [
    {
      "form": "閑話休題",
      "ruby": [
        [
          "閑",
          "かん"
        ],
        [
          "話",
          "わ"
        ],
        [
          "休",
          "きゅう"
        ],
        [
          "題",
          "だい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kanwa-kyūdai",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kan'wakiudai",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "かんわきうだい",
      "roman": "kan'wakiudai",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "かんわ-きゅうだい",
        "head": "閑話休題",
        "hhira": "かんわきうだい"
      },
      "expansion": "閑(かん)話(わ)休(きゅう)題(だい) • (kanwa-kyūdai) ^(←かんわきうだい (kan'wakiudai)?)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "related": [
    {
      "english": "main topic",
      "roman": "honsuji",
      "ruby": [
        [
          "本筋",
          "ほんすじ"
        ]
      ],
      "word": "本筋"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese interjections",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with four Han script characters"
      ],
      "glosses": [
        "setting idle chatter aside and returning to the main topic"
      ],
      "links": [
        [
          "setting",
          "set aside"
        ],
        [
          "idle",
          "idle"
        ],
        [
          "chatter",
          "chatter"
        ],
        [
          "aside",
          "set aside"
        ],
        [
          "main",
          "main"
        ],
        [
          "topic",
          "topic"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "かんわきゅうだい"
    },
    {
      "ipa": "[kã̠ɰ̃ɰᵝa̠kʲɨᵝːda̠i]"
    }
  ],
  "word": "閑話休題"
}

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

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "閑話休題"
  ],
  "section": "Japanese",
  "subsection": "interjection",
  "title": "閑話休題",
  "trace": ""
}