"äimistyessä" meaning in Finnish

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "verb form"
      },
      "expansion": "äimistyessä",
      "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"
        }
      ],
      "form_of": [
        {
          "word": "second active infinitive of äimistyä"
        }
      ],
      "glosses": [
        "inessive of second active infinitive of äimistyä"
      ],
      "id": "en-äimistyessä-fi-verb-6Fgjivnx",
      "links": [
        [
          "äimistyä",
          "äimistyä#Finnish"
        ]
      ],
      "tags": [
        "form-of",
        "inessive"
      ]
    }
  ],
  "word": "äimistyessä"
}

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "verb form"
      },
      "expansion": "äimistyessä",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Finnish active second infinitives",
        "Finnish entries with incorrect language header",
        "Finnish non-lemma forms",
        "Finnish verb forms"
      ],
      "form_of": [
        {
          "word": "second active infinitive of äimistyä"
        }
      ],
      "glosses": [
        "inessive of second active infinitive of äimistyä"
      ],
      "links": [
        [
          "äimistyä",
          "äimistyä#Finnish"
        ]
      ],
      "tags": [
        "form-of",
        "inessive"
      ]
    }
  ],
  "word": "äimistyessä"
}