"roi des cailles" meaning in French

{
  "forms": [
    {
      "form": "rois des cailles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "roi des cailles m (plural rois des cailles)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "fr",
          "name": "Rallids",
          "orig": "fr:Rallids",
          "parents": [
            "Gruiforms",
            "Freshwater birds",
            "Birds",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "corncrake"
      ],
      "id": "en-roi_des_cailles-fr-noun-LCGes6g6",
      "links": [
        [
          "corncrake",
          "corncrake"
        ]
      ],
      "synonyms": [
        {
          "word": "râle des genêts"
        },
        {
          "word": "roi caille"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁwa de kaj/"
    }
  ],
  "word": "roi des cailles"
}

{
  "forms": [
    {
      "form": "rois des cailles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "roi des cailles m (plural rois des cailles)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Rallids"
      ],
      "glosses": [
        "corncrake"
      ],
      "links": [
        [
          "corncrake",
          "corncrake"
        ]
      ],
      "synonyms": [
        {
          "word": "râle des genêts"
        },
        {
          "word": "roi caille"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʁwa de kaj/"
    }
  ],
  "word": "roi des cailles"
}