"cold iron" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "alt_of": [
        {
          "extra": "swords, knives, bladed weapons",
          "word": "cold steel"
        }
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      "examples": [
        {
          "ref": "1771, Tobias Smollett, The Expedition of Humphry Clinker:",
          "text": "This scene passed in presence of Lieutenant Lismahago, who encouraged Clinker to hazard a thrust of cold iron with his antagonist.",
          "type": "quote"
        },
        {
          "ref": "1910, Rudyard Kipling, “Cold Iron”, in Rewards and Fairies:",
          "text": "'Gold is for the mistress — silver for the maid — / Copper for the craftsman cunning at his trade.' / 'Good!' said the Baron, sitting in his hall, / 'But Iron — Cold Iron — is master of them all.'",
          "type": "quote"
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        "Alternative form of cold steel (“swords, knives, bladed weapons”)"
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      "glosses": [
        "a (possibly fictional) substance harmful to fairies; depending on the story, ordinary iron or iron treated in some way"
      ],
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        "(mythology) a (possibly fictional) substance harmful to fairies; depending on the story, ordinary iron or iron treated in some way"
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  "word": "cold iron"
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  "pos": "noun",
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          "word": "cold steel"
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          "ref": "1771, Tobias Smollett, The Expedition of Humphry Clinker:",
          "text": "This scene passed in presence of Lieutenant Lismahago, who encouraged Clinker to hazard a thrust of cold iron with his antagonist.",
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        },
        {
          "ref": "1910, Rudyard Kipling, “Cold Iron”, in Rewards and Fairies:",
          "text": "'Gold is for the mistress — silver for the maid — / Copper for the craftsman cunning at his trade.' / 'Good!' said the Baron, sitting in his hall, / 'But Iron — Cold Iron — is master of them all.'",
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        }
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        "Alternative form of cold steel (“swords, knives, bladed weapons”)"
      ],
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        "a (possibly fictional) substance harmful to fairies; depending on the story, ordinary iron or iron treated in some way"
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        "(mythology) a (possibly fictional) substance harmful to fairies; depending on the story, ordinary iron or iron treated in some way"
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