"fork lightning" meaning in English

{
  "forms": [
    {
      "form": "fork lightnings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "fork lightning (usually uncountable, plural fork lightnings)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Lightning",
          "orig": "en:Lightning",
          "parents": [
            "Electricity",
            "Weather",
            "Electromagnetism",
            "Atmosphere",
            "Physics",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1959, Moore Raymond, Smiley Roams the Road, London: Hulton Press, page 131:",
          "text": "It did not occur to him to be afraid of the vivid fork lightning or the loud thunder that reverberated down the valley.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Lightning that contains bolts that branch."
      ],
      "id": "en-fork_lightning-en-noun-UEuj4Y5H",
      "links": [
        [
          "Lightning",
          "lightning"
        ],
        [
          "bolt",
          "bolt"
        ],
        [
          "branch",
          "branch"
        ]
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "fork lightning"
}

{
  "forms": [
    {
      "form": "fork lightnings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "fork lightning (usually uncountable, plural fork lightnings)",
      "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",
        "English uncountable nouns",
        "Pages with 1 entry",
        "en:Lightning"
      ],
      "examples": [
        {
          "ref": "1959, Moore Raymond, Smiley Roams the Road, London: Hulton Press, page 131:",
          "text": "It did not occur to him to be afraid of the vivid fork lightning or the loud thunder that reverberated down the valley.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Lightning that contains bolts that branch."
      ],
      "links": [
        [
          "Lightning",
          "lightning"
        ],
        [
          "bolt",
          "bolt"
        ],
        [
          "branch",
          "branch"
        ]
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "fork lightning"
}