"fellrunning" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fell",
        "3": "running"
      },
      "expansion": "fell + running",
      "name": "compound"
    }
  ],
  "etymology_text": "From fell + running.",
  "forms": [
    {
      "form": "fell running",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fellrunning (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Running in the fells, or similar steep terrain, as a pastime or sport."
      ],
      "id": "en-fellrunning-en-noun-YB2aqJwT",
      "links": [
        [
          "Running",
          "run"
        ],
        [
          "fell",
          "fell"
        ]
      ],
      "related": [
        {
          "word": "fell run"
        },
        {
          "word": "fell runner"
        },
        {
          "word": "fellwalking"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "fellrunning"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fell",
        "3": "running"
      },
      "expansion": "fell + running",
      "name": "compound"
    }
  ],
  "etymology_text": "From fell + running.",
  "forms": [
    {
      "form": "fell running",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fellrunning (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "fell run"
    },
    {
      "word": "fell runner"
    },
    {
      "word": "fellwalking"
    }
  ],
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Running in the fells, or similar steep terrain, as a pastime or sport."
      ],
      "links": [
        [
          "Running",
          "run"
        ],
        [
          "fell",
          "fell"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "fellrunning"
}