"грозивши" meaning in Ukrainien

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en ukrainien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ukrainien",
      "orig": "ukrainien",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ukrainien",
  "lang_code": "uk",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "грозити"
        }
      ],
      "glosses": [
        "Gérondif passé de грози́ти"
      ],
      "id": "fr-грозивши-uk-verb-aN43h5nP"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "грозивши"
}

{
  "categories": [
    "Formes de verbes en ukrainien",
    "ukrainien"
  ],
  "lang": "Ukrainien",
  "lang_code": "uk",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "грозити"
        }
      ],
      "glosses": [
        "Gérondif passé de грози́ти"
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "грозивши"
}