"impossible dream" meaning in English

{
  "etymology_text": "From Don Quixote.",
  "forms": [
    {
      "form": "impossible dreams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "impossible dream (plural impossible dreams)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1996, Alan Parker, Oliver Stone, Evita",
          "text": "Tell me before I seek worthier pastures / And thereby restore self-esteem / How can you be so short-sighted / To look never further than this week or next week / To have no impossible dream?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A belief or goal which is unattainable despite the pursuer's high hopes."
      ],
      "id": "en-impossible_dream-en-noun-eLhItN7d",
      "links": [
        [
          "belief",
          "belief"
        ],
        [
          "goal",
          "goal"
        ],
        [
          "unattainable",
          "unattainable"
        ],
        [
          "high hopes",
          "high hopes"
        ]
      ],
      "raw_glosses": [
        "(figuratively) A belief or goal which is unattainable despite the pursuer's high hopes."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "impossible dream"
}

{
  "etymology_text": "From Don Quixote.",
  "forms": [
    {
      "form": "impossible dreams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "impossible dream (plural impossible dreams)",
      "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",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1996, Alan Parker, Oliver Stone, Evita",
          "text": "Tell me before I seek worthier pastures / And thereby restore self-esteem / How can you be so short-sighted / To look never further than this week or next week / To have no impossible dream?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A belief or goal which is unattainable despite the pursuer's high hopes."
      ],
      "links": [
        [
          "belief",
          "belief"
        ],
        [
          "goal",
          "goal"
        ],
        [
          "unattainable",
          "unattainable"
        ],
        [
          "high hopes",
          "high hopes"
        ]
      ],
      "raw_glosses": [
        "(figuratively) A belief or goal which is unattainable despite the pursuer's high hopes."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "impossible dream"
}