"hard as iron" meaning in English

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      "expansion": "hard as iron (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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      "examples": [
        {
          "ref": "2006, Nancy M. Tischler, All Things in the Bible, →ISBN, page 411:",
          "text": "The Torah notes that a teacher of the law must be as hard as iron.",
          "type": "quote"
        },
        {
          "ref": "2011, Gillian Clarke, At the Source: A Writer's Year, →ISBN:",
          "text": "Christina Rossetti takes up the theme: In the bleak midwinter Frosty wind made moan, Earth stood hard as iron, Water like a stone, Snow had fallen, snow on snow, Snow on snow, In the bleak midwinter Long ago",
          "type": "quote"
        },
        {
          "ref": "2014, Stephanie Draven, Poisoned Kisses, →ISBN:",
          "text": "“If you tried to tell me what to do, we'd only end up engaged in a fierce battle of wills.” She felt him smirk against her neck. “Mine is hard as iron.” His will. He meant his will was hard as iron.",
          "type": "quote"
        },
        {
          "ref": "2015, Lee Bond, Dark Iron King I: Thy King's Will Be Done:",
          "text": "A simple rap on the forehead with a fist hard as iron and their Fishy-Fish blacksmith would down for the count.",
          "type": "quote"
        }
      ],
      "glosses": [
        "very hard"
      ],
      "id": "en-hard_as_iron-en-adj-UF8f5ykm",
      "links": [
        [
          "hard",
          "hard"
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      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) very hard"
      ],
      "tags": [
        "not-comparable"
      ]
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  "word": "hard as iron"
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      "expansion": "hard as iron (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        {
          "ref": "2006, Nancy M. Tischler, All Things in the Bible, →ISBN, page 411:",
          "text": "The Torah notes that a teacher of the law must be as hard as iron.",
          "type": "quote"
        },
        {
          "ref": "2011, Gillian Clarke, At the Source: A Writer's Year, →ISBN:",
          "text": "Christina Rossetti takes up the theme: In the bleak midwinter Frosty wind made moan, Earth stood hard as iron, Water like a stone, Snow had fallen, snow on snow, Snow on snow, In the bleak midwinter Long ago",
          "type": "quote"
        },
        {
          "ref": "2014, Stephanie Draven, Poisoned Kisses, →ISBN:",
          "text": "“If you tried to tell me what to do, we'd only end up engaged in a fierce battle of wills.” She felt him smirk against her neck. “Mine is hard as iron.” His will. He meant his will was hard as iron.",
          "type": "quote"
        },
        {
          "ref": "2015, Lee Bond, Dark Iron King I: Thy King's Will Be Done:",
          "text": "A simple rap on the forehead with a fist hard as iron and their Fishy-Fish blacksmith would down for the count.",
          "type": "quote"
        }
      ],
      "glosses": [
        "very hard"
      ],
      "links": [
        [
          "hard",
          "hard"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) very hard"
      ],
      "tags": [
        "not-comparable"
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  "word": "hard as iron"
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