"scacco perpetuo" meaning in Italian

{
  "forms": [
    {
      "form": "scacchi perpetui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "scacco perpetuo m (plural scacchi perpetui)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian 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": "topical",
          "langcode": "it",
          "name": "Chess",
          "orig": "it:Chess",
          "parents": [
            "Board games",
            "Tabletop games",
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "perpetual check"
      ],
      "id": "en-scacco_perpetuo-it-noun-GPqowmDh",
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "perpetual check",
          "perpetual check"
        ]
      ],
      "raw_glosses": [
        "(chess) perpetual check"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ],
      "wikipedia": [
        "it:scacco perpetuo"
      ]
    }
  ],
  "word": "scacco perpetuo"
}

{
  "forms": [
    {
      "form": "scacchi perpetui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "scacco perpetuo m (plural scacchi perpetui)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian multiword terms",
        "Italian nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "it:Chess"
      ],
      "glosses": [
        "perpetual check"
      ],
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "perpetual check",
          "perpetual check"
        ]
      ],
      "raw_glosses": [
        "(chess) perpetual check"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ],
      "wikipedia": [
        "it:scacco perpetuo"
      ]
    }
  ],
  "word": "scacco perpetuo"
}