"of a sudden" meaning in English

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      "expansion": "of a sudden",
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      "args": {},
      "expansion": "of a sudden",
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  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "alt_of": [
        {
          "word": "all of a sudden"
        }
      ],
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        {
          "ref": "1914 November, Louis Joseph Vance, “An Outsider […]”, in Munsey’s Magazine, volume LIII, number II, New York, N.Y.: The Frank A[ndrew] Munsey Company, […], published 1915, →OCLC, chapter III (Accessory After the Fact), page 382, column 1:",
          "text": "Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of all of a sudden"
      ],
      "id": "en-of_a_sudden-en-prep_phrase-4cAm2COy",
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          "all of a sudden",
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  "word": "of a sudden"
}

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      "expansion": "of a sudden",
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      "args": {},
      "expansion": "of a sudden",
      "name": "en-PP"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
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      "alt_of": [
        {
          "word": "all of a sudden"
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          "text": "Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of all of a sudden"
      ],
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  "word": "of a sudden"
}