"have a mountain to climb" meaning in English

{
  "forms": [
    {
      "form": "has a mountain to climb",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having a mountain to climb",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had a mountain to climb",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had a mountain to climb",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> a mountain to climb"
      },
      "expansion": "have a mountain to climb (third-person singular simple present has a mountain to climb, present participle having a mountain to climb, simple past and past participle had a mountain to climb)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2011 October 1, Phil Dawkes, “Sunderland 2 - 2 West Brom”, in BBC Sport",
          "text": "The Black Cats had a mountain to climb after James Morrison's header and Shane Long's neat side-foot finish gave Albion a 2-0 lead five minutes in.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To face a difficult task or challenge."
      ],
      "id": "en-have_a_mountain_to_climb-en-verb-m2skIRxG",
      "links": [
        [
          "difficult",
          "difficult"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To face a difficult task or challenge."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-have a mountain to climb.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/96/En-au-have_a_mountain_to_climb.ogg/En-au-have_a_mountain_to_climb.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/96/En-au-have_a_mountain_to_climb.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "have a mountain to climb"
}

{
  "forms": [
    {
      "form": "has a mountain to climb",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having a mountain to climb",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had a mountain to climb",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had a mountain to climb",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> a mountain to climb"
      },
      "expansion": "have a mountain to climb (third-person singular simple present has a mountain to climb, present participle having a mountain to climb, simple past and past participle had a mountain to climb)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "English terms with quotations",
        "English verbs"
      ],
      "examples": [
        {
          "ref": "2011 October 1, Phil Dawkes, “Sunderland 2 - 2 West Brom”, in BBC Sport",
          "text": "The Black Cats had a mountain to climb after James Morrison's header and Shane Long's neat side-foot finish gave Albion a 2-0 lead five minutes in.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To face a difficult task or challenge."
      ],
      "links": [
        [
          "difficult",
          "difficult"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To face a difficult task or challenge."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-have a mountain to climb.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/96/En-au-have_a_mountain_to_climb.ogg/En-au-have_a_mountain_to_climb.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/96/En-au-have_a_mountain_to_climb.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "have a mountain to climb"
}