"bâtir des châteaux en Espagne" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "to build castles in Spain"
      },
      "expansion": "“to build castles in Spain”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "to build castles in Spain"
      },
      "expansion": "Literally, “to build castles in Spain”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “to build castles in Spain”.",
  "head_templates": [
    {
      "args": {},
      "expansion": "bâtir des châteaux en Espagne",
      "name": "fr-verb"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
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          "source": "w"
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      ],
      "glosses": [
        "to chase rainbows, to build castles in the air (to make overly ambitious plans)"
      ],
      "id": "en-bâtir_des_châteaux_en_Espagne-fr-verb-xdeOwBpu",
      "links": [
        [
          "chase rainbows",
          "chase rainbows"
        ],
        [
          "build castles in the air",
          "build castles in the air"
        ],
        [
          "ambitious",
          "ambitious#English"
        ]
      ],
      "raw_glosses": [
        "(figuratively) to chase rainbows, to build castles in the air (to make overly ambitious plans)"
      ],
      "synonyms": [
        {
          "word": "tirer des plans sur la comète"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ba.tiʁ de ʃa.to.z‿ɑ̃ ɛs.paɲ/"
    },
    {
      "ipa": "/bɑ.tiʁ de ʃɑ.to.z‿ɑ̃ ɛs.paɲ/"
    },
    {
      "audio": "Fr-Paris--bâtir des châteaux en Espagne.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/f4/Fr-Paris--b%C3%A2tir_des_ch%C3%A2teaux_en_Espagne.ogg/Fr-Paris--b%C3%A2tir_des_ch%C3%A2teaux_en_Espagne.ogg.mp3",
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    }
  ],
  "word": "bâtir des châteaux en Espagne"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "to build castles in Spain"
      },
      "expansion": "“to build castles in Spain”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "to build castles in Spain"
      },
      "expansion": "Literally, “to build castles in Spain”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “to build castles in Spain”.",
  "head_templates": [
    {
      "args": {},
      "expansion": "bâtir des châteaux en Espagne",
      "name": "fr-verb"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "senses": [
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        "French idioms",
        "French lemmas",
        "French multiword terms",
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        "French verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "to chase rainbows, to build castles in the air (to make overly ambitious plans)"
      ],
      "links": [
        [
          "chase rainbows",
          "chase rainbows"
        ],
        [
          "build castles in the air",
          "build castles in the air"
        ],
        [
          "ambitious",
          "ambitious#English"
        ]
      ],
      "raw_glosses": [
        "(figuratively) to chase rainbows, to build castles in the air (to make overly ambitious plans)"
      ],
      "synonyms": [
        {
          "word": "tirer des plans sur la comète"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ba.tiʁ de ʃa.to.z‿ɑ̃ ɛs.paɲ/"
    },
    {
      "ipa": "/bɑ.tiʁ de ʃɑ.to.z‿ɑ̃ ɛs.paɲ/"
    },
    {
      "audio": "Fr-Paris--bâtir des châteaux en Espagne.ogg",
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  ],
  "word": "bâtir des châteaux en Espagne"
}