"shudderings" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "ref": "1851 November 14, Herman Melville, Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC:",
          "text": "Such an added, gliding strangeness began to invest the thin Fedallah now; such ceaseless shudderings shook him; that the men looked dubious at him […]",
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          "word": "shuddering"
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  "lang_code": "en",
  "pos": "noun",
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          "ref": "1851 November 14, Herman Melville, Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC:",
          "text": "Such an added, gliding strangeness began to invest the thin Fedallah now; such ceaseless shudderings shook him; that the men looked dubious at him […]",
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  "word": "shudderings"
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