"sferra cavallo" meaning in Italian

{
  "forms": [
    {
      "form": "sferri cavalli",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "sferra cavallo m (plural sferri cavalli)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sferracavallo"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Italian nouns with irregular gender",
          "parents": [
            "Nouns with irregular gender",
            "Irregular nouns",
            "Nouns by inflection type",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative spelling of sferracavallo"
      ],
      "id": "en-sferra_cavallo-it-noun-3utWRbEp",
      "links": [
        [
          "sferracavallo",
          "sferracavallo#Italian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine"
      ]
    }
  ],
  "word": "sferra cavallo"
}

{
  "forms": [
    {
      "form": "sferri cavalli",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "sferra cavallo m (plural sferri cavalli)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sferracavallo"
        }
      ],
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian multiword terms",
        "Italian nouns",
        "Italian nouns with irregular gender",
        "Italian nouns with red links in their headword lines",
        "Pages with 1 entry"
      ],
      "glosses": [
        "Alternative spelling of sferracavallo"
      ],
      "links": [
        [
          "sferracavallo",
          "sferracavallo#Italian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine"
      ]
    }
  ],
  "word": "sferra cavallo"
}