"ground fog" meaning in English

{
  "forms": [
    {
      "form": "ground fogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground fog (plural ground fogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Weather",
          "orig": "en:Weather",
          "parents": [
            "Atmosphere",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1959 September, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 432",
          "text": "Ground fog had been hanging about all day, and after leaving Cambridge we had the curious experience of running through quite a thick fog, yet above the top of which most of the signals were clearly visible.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A low-lying fog extending only a few feet above ground."
      ],
      "id": "en-ground_fog-en-noun-HlvHDBhm",
      "links": [
        [
          "low-lying",
          "low-lying"
        ]
      ],
      "raw_glosses": [
        "(weather) A low-lying fog extending only a few feet above ground."
      ],
      "synonyms": [
        {
          "word": "ground mist"
        }
      ],
      "topics": [
        "climatology",
        "meteorology",
        "natural-sciences",
        "weather"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "matala sumu"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "Bodennebel"
        }
      ]
    }
  ],
  "word": "ground fog"
}

{
  "forms": [
    {
      "form": "ground fogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground fog (plural ground fogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Translation table header lacks gloss",
        "en:Weather"
      ],
      "examples": [
        {
          "ref": "1959 September, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 432",
          "text": "Ground fog had been hanging about all day, and after leaving Cambridge we had the curious experience of running through quite a thick fog, yet above the top of which most of the signals were clearly visible.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A low-lying fog extending only a few feet above ground."
      ],
      "links": [
        [
          "low-lying",
          "low-lying"
        ]
      ],
      "raw_glosses": [
        "(weather) A low-lying fog extending only a few feet above ground."
      ],
      "topics": [
        "climatology",
        "meteorology",
        "natural-sciences",
        "weather"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ground mist"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "matala sumu"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "Bodennebel"
    }
  ],
  "word": "ground fog"
}