"per caso" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "per cāsū"
      },
      "expansion": "Latin per cāsū",
      "name": "uder"
    },
    {
      "args": {
        "1": "la",
        "2": "casus"
      },
      "expansion": "casus",
      "name": "m"
    }
  ],
  "etymology_text": "From Latin per cāsū, ablative of casus.",
  "head_templates": [
    {
      "args": {},
      "expansion": "per caso",
      "name": "it-adv"
    }
  ],
  "hyphenation": [
    "per‧cà‧so"
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Italian undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "by chance, by the way"
      ],
      "id": "en-per_caso-it-adv-kI5MNXL0",
      "links": [
        [
          "by chance",
          "by chance"
        ],
        [
          "by the way",
          "by the way"
        ]
      ],
      "synonyms": [
        {
          "word": "casualmente"
        },
        {
          "word": "per accidente"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/per ˈka.zo/"
    }
  ],
  "word": "per caso"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "per cāsū"
      },
      "expansion": "Latin per cāsū",
      "name": "uder"
    },
    {
      "args": {
        "1": "la",
        "2": "casus"
      },
      "expansion": "casus",
      "name": "m"
    }
  ],
  "etymology_text": "From Latin per cāsū, ablative of casus.",
  "head_templates": [
    {
      "args": {},
      "expansion": "per caso",
      "name": "it-adv"
    }
  ],
  "hyphenation": [
    "per‧cà‧so"
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Italian adverbs",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian multiword terms",
        "Italian terms derived from Latin",
        "Italian terms with IPA pronunciation",
        "Italian terms with audio links",
        "Italian undefined derivations"
      ],
      "glosses": [
        "by chance, by the way"
      ],
      "links": [
        [
          "by chance",
          "by chance"
        ],
        [
          "by the way",
          "by the way"
        ]
      ],
      "synonyms": [
        {
          "word": "casualmente"
        },
        {
          "word": "per accidente"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/per ˈka.zo/"
    }
  ],
  "word": "per caso"
}