"leaf-fall" meaning in English

{
  "head_templates": [
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      "args": {
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      "expansion": "leaf-fall (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "leaffall"
        }
      ],
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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            "Entries with incorrect language header",
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          "source": "w"
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      "examples": [
        {
          "ref": "2021 November 17, Philip Haigh, “Finding answers to low adhesion remains a high priority”, in RAIL, number 944, page 50",
          "text": "The report summary said: \"The investigation found that there was contamination of the railhead in the area caused by leaf-fall and atmospheric conditions. [...].\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of leaffall"
      ],
      "id": "en-leaf-fall-en-noun-61hdBqlH",
      "links": [
        [
          "leaffall",
          "leaffall#English"
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      ],
      "tags": [
        "alt-of",
        "alternative",
        "uncountable"
      ]
    }
  ],
  "word": "leaf-fall"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "leaf-fall (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "leaffall"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "ref": "2021 November 17, Philip Haigh, “Finding answers to low adhesion remains a high priority”, in RAIL, number 944, page 50",
          "text": "The report summary said: \"The investigation found that there was contamination of the railhead in the area caused by leaf-fall and atmospheric conditions. [...].\"",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of leaffall"
      ],
      "links": [
        [
          "leaffall",
          "leaffall#English"
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  "word": "leaf-fall"
}