"царь царей" meaning in Russe

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Russe",
      "orig": "russe",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "tsarʹ tsareï"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en russe de l’histoire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en russe",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Roi des rois."
      ],
      "id": "fr-царь_царей-ru-noun-T0UaQGaz",
      "topics": [
        "history"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "шахиншах"
    }
  ],
  "word": "царь царей"
}

{
  "categories": [
    "Locutions nominales en russe",
    "russe"
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "tsarʹ tsareï"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en russe de l’histoire",
        "Wiktionnaire:Exemples manquants en russe"
      ],
      "glosses": [
        "Roi des rois."
      ],
      "topics": [
        "history"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "шахиншах"
    }
  ],
  "word": "царь царей"
}