"fuoco fatuo" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "ignis fatuus"
      },
      "expansion": "Calque of Latin ignis fatuus",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Latin ignis fatuus.",
  "forms": [
    {
      "form": "fuochi fatui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "fuoco fatuo m (plural fuochi fatui)",
      "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"
        }
      ],
      "glosses": [
        "will o' the wisp"
      ],
      "id": "en-fuoco_fatuo-it-noun-SWJvOStG",
      "links": [
        [
          "will o' the wisp",
          "will o' the wisp"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "fuoco fatuo"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "ignis fatuus"
      },
      "expansion": "Calque of Latin ignis fatuus",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Latin ignis fatuus.",
  "forms": [
    {
      "form": "fuochi fatui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "fuoco fatuo m (plural fuochi fatui)",
      "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",
        "Italian terms calqued from Latin",
        "Italian terms derived from Latin",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "will o' the wisp"
      ],
      "links": [
        [
          "will o' the wisp",
          "will o' the wisp"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "fuoco fatuo"
}