"jäi" meaning in Finnish

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "verb form"
      },
      "expansion": "jäi",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "jäädä"
        }
      ],
      "glosses": [
        "third-person singular past indicative of jäädä"
      ],
      "id": "en-jäi-fi-verb-AG-tae5c",
      "links": [
        [
          "jäädä",
          "jäädä#Finnish"
        ]
      ],
      "tags": [
        "form-of",
        "indicative",
        "past",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈjæi̯/"
    },
    {
      "ipa": "[ˈjæi̯]"
    },
    {
      "rhymes": "-æi"
    }
  ],
  "word": "jäi"
}

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "verb form"
      },
      "expansion": "jäi",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Finnish 1-syllable words",
        "Finnish entries with incorrect language header",
        "Finnish non-lemma forms",
        "Finnish terms with IPA pronunciation",
        "Finnish verb forms",
        "Pages with 2 entries",
        "Pages with entries",
        "Rhymes:Finnish/æi",
        "Rhymes:Finnish/æi/1 syllable"
      ],
      "form_of": [
        {
          "word": "jäädä"
        }
      ],
      "glosses": [
        "third-person singular past indicative of jäädä"
      ],
      "links": [
        [
          "jäädä",
          "jäädä#Finnish"
        ]
      ],
      "tags": [
        "form-of",
        "indicative",
        "past",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈjæi̯/"
    },
    {
      "ipa": "[ˈjæi̯]"
    },
    {
      "rhymes": "-æi"
    }
  ],
  "word": "jäi"
}