"heure bleue" meaning in French

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "blue hour"
          },
          "expansion": "English: blue hour",
          "name": "desc"
        }
      ],
      "text": "English: blue hour"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "de",
            "2": "blaue Stunde",
            "g": "f"
          },
          "expansion": "German: blaue Stunde f",
          "name": "desc"
        }
      ],
      "text": "German: blaue Stunde f"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "heure",
        "3": "bleue"
      },
      "expansion": "heure + bleue",
      "name": "com"
    }
  ],
  "etymology_text": "heure + bleue",
  "forms": [
    {
      "form": "heures bleues",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "heure bleue f (plural heures bleues)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Times of day",
          "orig": "fr:Times of day",
          "parents": [
            "Periodic occurrences",
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "tags": [
            "feminine"
          ],
          "word": "heure dorée"
        }
      ],
      "glosses": [
        "blue hour"
      ],
      "id": "en-heure_bleue-fr-noun-BCOmBcoO",
      "links": [
        [
          "blue hour",
          "blue hour#English"
        ]
      ],
      "synonyms": [
        {
          "word": "entre chien et loup"
        },
        {
          "word": "brunante"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "other": "/œʁ blø/"
    }
  ],
  "word": "heure bleue"
}

{
  "coordinate_terms": [
    {
      "tags": [
        "feminine"
      ],
      "word": "heure dorée"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "blue hour"
          },
          "expansion": "English: blue hour",
          "name": "desc"
        }
      ],
      "text": "English: blue hour"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "de",
            "2": "blaue Stunde",
            "g": "f"
          },
          "expansion": "German: blaue Stunde f",
          "name": "desc"
        }
      ],
      "text": "German: blaue Stunde f"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "heure",
        "3": "bleue"
      },
      "expansion": "heure + bleue",
      "name": "com"
    }
  ],
  "etymology_text": "heure + bleue",
  "forms": [
    {
      "form": "heures bleues",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "heure bleue f (plural heures bleues)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French compound terms",
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "fr:Times of day"
      ],
      "glosses": [
        "blue hour"
      ],
      "links": [
        [
          "blue hour",
          "blue hour#English"
        ]
      ],
      "synonyms": [
        {
          "word": "entre chien et loup"
        },
        {
          "word": "brunante"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "other": "/œʁ blø/"
    }
  ],
  "word": "heure bleue"
}