"hard freeze" meaning in English

{
  "forms": [
    {
      "form": "hard freezes",
      "tags": [
        "plural"
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    }
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    {
      "args": {},
      "expansion": "hard freeze (plural hard freezes)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Meteorology",
          "orig": "en:Meteorology",
          "parents": [
            "Atmosphere",
            "Earth sciences",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
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        }
      ],
      "glosses": [
        "A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US."
      ],
      "id": "en-hard_freeze-en-noun-HSk5x3z1",
      "links": [
        [
          "meteorology",
          "meteorology"
        ]
      ],
      "raw_glosses": [
        "(meteorology) A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US."
      ],
      "synonyms": [
        {
          "word": "killing freeze"
        }
      ],
      "topics": [
        "climatology",
        "meteorology",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "freeze sufficiently long and severe to destroy seasonal vegetation",
          "word": "ankara halla"
        }
      ]
    }
  ],
  "word": "hard freeze"
}

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  "forms": [
    {
      "form": "hard freezes",
      "tags": [
        "plural"
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      "expansion": "hard freeze (plural hard freezes)",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US."
      ],
      "links": [
        [
          "meteorology",
          "meteorology"
        ]
      ],
      "raw_glosses": [
        "(meteorology) A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US."
      ],
      "topics": [
        "climatology",
        "meteorology",
        "natural-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "killing freeze"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "freeze sufficiently long and severe to destroy seasonal vegetation",
      "word": "ankara halla"
    }
  ],
  "word": "hard freeze"
}