"なんだって" meaning in Japanese

{
  "forms": [
    {
      "form": "nan da tte",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "なん だ って"
      },
      "expansion": "なんだって • (nan da tte)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "92 8",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "89 11",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "94 6",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "come again? what did you say again? (asking the listener to repeat what was said)"
      ],
      "id": "en-なんだって-ja-intj-NFrc~rY3",
      "links": [
        [
          "come again",
          "come again"
        ],
        [
          "what",
          "what"
        ],
        [
          "say",
          "say"
        ],
        [
          "again",
          "again"
        ]
      ]
    },
    {
      "glosses": [
        "what!? (expressing disbelief and shock)"
      ],
      "id": "en-なんだって-ja-intj-UysdGtJM",
      "links": [
        [
          "what",
          "what"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[na̠n da̠ t̚te̞]"
    }
  ],
  "synonyms": [
    {
      "_dis1": "0 0",
      "roman": "nani o",
      "word": "何を"
    },
    {
      "_dis1": "0 0",
      "roman": "nani",
      "word": "何"
    },
    {
      "_dis1": "0 0",
      "roman": "nan da to",
      "word": "なんだと"
    }
  ],
  "word": "なんだって"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese hiragana",
    "Japanese interjections",
    "Japanese lemmas",
    "Japanese links with redundant alt parameters",
    "Japanese links with redundant wikilinks",
    "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"
  ],
  "forms": [
    {
      "form": "nan da tte",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "なん だ って"
      },
      "expansion": "なんだって • (nan da tte)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "senses": [
    {
      "glosses": [
        "come again? what did you say again? (asking the listener to repeat what was said)"
      ],
      "links": [
        [
          "come again",
          "come again"
        ],
        [
          "what",
          "what"
        ],
        [
          "say",
          "say"
        ],
        [
          "again",
          "again"
        ]
      ]
    },
    {
      "glosses": [
        "what!? (expressing disbelief and shock)"
      ],
      "links": [
        [
          "what",
          "what"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[na̠n da̠ t̚te̞]"
    }
  ],
  "synonyms": [
    {
      "roman": "nani o",
      "word": "何を"
    },
    {
      "roman": "nani",
      "word": "何"
    },
    {
      "roman": "nan da to",
      "word": "なんだと"
    }
  ],
  "word": "なんだって"
}

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