"olipa kerran" meaning in Finnish

{
  "etymology_text": "oli -pa kerran",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "phrase",
        "head": "olipa kerran"
      },
      "expansion": "olipa kerran",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Finnish entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fi",
          "name": "Fairy tale",
          "orig": "fi:Fairy tale",
          "parents": [
            "Fiction",
            "Artistic works",
            "Art",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fi",
          "name": "Fiction",
          "orig": "fi:Fiction",
          "parents": [
            "Artistic works",
            "Art",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fi",
          "name": "Narratology",
          "orig": "fi:Narratology",
          "parents": [
            "Drama",
            "Literature",
            "Theater",
            "Culture",
            "Entertainment",
            "Writing",
            "Art",
            "Society",
            "Human behaviour",
            "Language",
            "All topics",
            "Human",
            "Communication",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fi",
          "name": "Plot devices",
          "orig": "fi:Plot devices",
          "parents": [
            "Fiction",
            "Narratology",
            "Artistic works",
            "Drama",
            "Literature",
            "Art",
            "Theater",
            "Culture",
            "Entertainment",
            "Writing",
            "Society",
            "Human behaviour",
            "Language",
            "All topics",
            "Human",
            "Communication",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fi",
          "name": "Time",
          "orig": "fi:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Once upon a time there was a wolf...",
          "text": "Olipa kerran susi...",
          "type": "example"
        }
      ],
      "glosses": [
        "once upon a time there was"
      ],
      "id": "en-olipa_kerran-fi-phrase-F5QCyuAt",
      "links": [
        [
          "once upon a time",
          "once upon a time"
        ]
      ],
      "raw_glosses": [
        "(used at the beginnings of fairytales) once upon a time there was"
      ],
      "raw_tags": [
        "used at the beginnings of fairytales"
      ]
    }
  ],
  "word": "olipa kerran"
}

{
  "etymology_text": "oli -pa kerran",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "phrase",
        "head": "olipa kerran"
      },
      "expansion": "olipa kerran",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Finnish entries with incorrect language header",
        "Finnish entries with topic categories using raw markup",
        "Finnish lemmas",
        "Finnish multiword terms",
        "Finnish phrases",
        "Finnish terms with usage examples",
        "Pages with 1 entry",
        "fi:Fairy tale",
        "fi:Fiction",
        "fi:Narratology",
        "fi:Plot devices",
        "fi:Time"
      ],
      "examples": [
        {
          "english": "Once upon a time there was a wolf...",
          "text": "Olipa kerran susi...",
          "type": "example"
        }
      ],
      "glosses": [
        "once upon a time there was"
      ],
      "links": [
        [
          "once upon a time",
          "once upon a time"
        ]
      ],
      "raw_glosses": [
        "(used at the beginnings of fairytales) once upon a time there was"
      ],
      "raw_tags": [
        "used at the beginnings of fairytales"
      ]
    }
  ],
  "word": "olipa kerran"
}