"promettre monts et merveilles" meaning in French

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  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "senses": [
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      "glosses": [
        "to promise the moon, to promise the earth, to promise the stars (to make promises that are impossible to uphold)"
      ],
      "id": "en-promettre_monts_et_merveilles-fr-verb-wMoIsNpc",
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        [
          "promise the moon",
          "promise the moon"
        ],
        [
          "promise the earth",
          "promise the earth"
        ],
        [
          "promise the stars",
          "promise the stars"
        ],
        [
          "promise",
          "promise#English"
        ],
        [
          "uphold",
          "uphold#English"
        ]
      ],
      "raw_glosses": [
        "(figuratively) to promise the moon, to promise the earth, to promise the stars (to make promises that are impossible to uphold)"
      ],
      "related": [
        {
          "word": "vendre du rêve"
        },
        {
          "word": "autant en emporte le vent"
        }
      ],
      "synonyms": [
        {
          "word": "promettre la lune"
        },
        {
          "word": "promettre plus de beurre que de pain"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʁɔ.mɛ.tʁə mɔ̃.z‿e mɛʁ.vɛj/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-promettre monts et merveilles.wav",
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    }
  ],
  "word": "promettre monts et merveilles"
}

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      "expansion": "promettre monts et merveilles",
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  "lang": "French",
  "lang_code": "fr",
  "pos": "verb",
  "related": [
    {
      "word": "vendre du rêve"
    },
    {
      "word": "autant en emporte le vent"
    }
  ],
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      "glosses": [
        "to promise the moon, to promise the earth, to promise the stars (to make promises that are impossible to uphold)"
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        [
          "promise the moon",
          "promise the moon"
        ],
        [
          "promise the earth",
          "promise the earth"
        ],
        [
          "promise the stars",
          "promise the stars"
        ],
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          "promise",
          "promise#English"
        ],
        [
          "uphold",
          "uphold#English"
        ]
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      "raw_glosses": [
        "(figuratively) to promise the moon, to promise the earth, to promise the stars (to make promises that are impossible to uphold)"
      ],
      "synonyms": [
        {
          "word": "promettre la lune"
        },
        {
          "word": "promettre plus de beurre que de pain"
        }
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʁɔ.mɛ.tʁə mɔ̃.z‿e mɛʁ.vɛj/"
    },
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  "word": "promettre monts et merveilles"
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