"by thunder" meaning in English

{
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      "expansion": "by thunder (not comparable)",
      "name": "en-adv"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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      "examples": [
        {
          "ref": "1849, Masonic Signet and Literary Mirror, volume 1, page 379",
          "text": "\"Mr. Pillow, Sir, none of your impertinence, or I will chastise you as well as this fellow.\" \"That's a two handed game, by thunder,\" said Long Tom, \"[…] I dare you to deadly combat. […]\"",
          "type": "quotation"
        },
        {
          "ref": "1999, J. K. Rowling, Harry Potter and the Prisoner of Azkaban, Bloomsbury Publishing, page 283",
          "text": "'Shocking business ... shocking ... miracle none of them died ... never heard the like ... by thunder, it was lucky you were there, Snape ...'",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used for emphasis, sometimes with a threatening implication."
      ],
      "id": "en-by_thunder-en-adv-oi0GTAS1",
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "by thunder"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "by thunder (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adverbs",
        "Quotation templates to be cleaned"
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      "examples": [
        {
          "ref": "1849, Masonic Signet and Literary Mirror, volume 1, page 379",
          "text": "\"Mr. Pillow, Sir, none of your impertinence, or I will chastise you as well as this fellow.\" \"That's a two handed game, by thunder,\" said Long Tom, \"[…] I dare you to deadly combat. […]\"",
          "type": "quotation"
        },
        {
          "ref": "1999, J. K. Rowling, Harry Potter and the Prisoner of Azkaban, Bloomsbury Publishing, page 283",
          "text": "'Shocking business ... shocking ... miracle none of them died ... never heard the like ... by thunder, it was lucky you were there, Snape ...'",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used for emphasis, sometimes with a threatening implication."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "by thunder"
}