"arrugginissero" meaning in Italian

{
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "verb form"
      },
      "expansion": "arrugginissero",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "arrugginire"
        }
      ],
      "glosses": [
        "third-person plural imperfect subjunctive of arrugginire"
      ],
      "id": "en-arrugginissero-it-verb-BFoHMGB5",
      "links": [
        [
          "arrugginire",
          "arrugginire#Italian"
        ]
      ],
      "tags": [
        "form-of",
        "imperfect",
        "plural",
        "subjunctive",
        "third-person"
      ]
    }
  ],
  "word": "arrugginissero"
}

{
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "verb form"
      },
      "expansion": "arrugginissero",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian non-lemma forms",
        "Italian verb forms"
      ],
      "form_of": [
        {
          "word": "arrugginire"
        }
      ],
      "glosses": [
        "third-person plural imperfect subjunctive of arrugginire"
      ],
      "links": [
        [
          "arrugginire",
          "arrugginire#Italian"
        ]
      ],
      "tags": [
        "form-of",
        "imperfect",
        "plural",
        "subjunctive",
        "third-person"
      ]
    }
  ],
  "word": "arrugginissero"
}