"泰山鳴動して鼠一匹" meaning in Japanese

{
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "soft-redirect",
  "redirects": [
    "大山鳴動して鼠一匹"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese terms with missing yomi",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w"
        }
      ],
      "id": "en-泰山鳴動して鼠一匹-ja-soft-redirect-47DEQpj8",
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "泰山鳴動して鼠一匹"
}

{
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "soft-redirect",
  "redirects": [
    "大山鳴動して鼠一匹"
  ],
  "senses": [
    {
      "categories": [
        "Japanese terms spelled with 一 read as いち",
        "Japanese terms spelled with 動 read as どう",
        "Japanese terms spelled with 匹 read as ひき",
        "Japanese terms spelled with 山 read as さん",
        "Japanese terms spelled with 泰 read as たい",
        "Japanese terms spelled with 鳴 read as めい",
        "Japanese terms spelled with 鼠 read as ねずみ",
        "Japanese terms with missing yomi",
        "Japanese terms with non-redundant non-automated sortkeys"
      ],
      "tags": [
        "no-gloss"
      ]
    }
  ],
  "word": "泰山鳴動して鼠一匹"
}