"がたん" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 オノマトペ",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 副詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 国際音声記号あり",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "adv",
  "pos_title": "副詞",
  "senses": [
    {
      "glosses": [
        "堅くて重い物が当たって立てる音。"
      ],
      "id": "ja-がたん-ja-adv-NPhhscdH"
    },
    {
      "glosses": [
        "数量・成績・順位などが急激に低下するさま。"
      ],
      "id": "ja-がたん-ja-adv-wgYUW5OL"
    }
  ],
  "sounds": [
    {
      "form": "がたん",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[gàtáꜜǹ]",
      "tags": [
        "Nakadaka"
      ]
    },
    {
      "ipa": "[ɡa̠tã̠ɴ]"
    }
  ],
  "word": "がたん"
}

{
  "categories": [
    "日本語",
    "日本語 オノマトペ",
    "日本語 副詞",
    "日本語 国際音声記号あり"
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "adv",
  "pos_title": "副詞",
  "senses": [
    {
      "glosses": [
        "堅くて重い物が当たって立てる音。"
      ]
    },
    {
      "glosses": [
        "数量・成績・順位などが急激に低下するさま。"
      ]
    }
  ],
  "sounds": [
    {
      "form": "がたん",
      "raw_tags": [
        "東京式"
      ],
      "roman": "[gàtáꜜǹ]",
      "tags": [
        "Nakadaka"
      ]
    },
    {
      "ipa": "[ɡa̠tã̠ɴ]"
    }
  ],
  "word": "がたん"
}