"брюзжавши" meaning in Russe

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Russe",
      "orig": "russe",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "брюзжа́вши",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "брюзжать"
        }
      ],
      "glosses": [
        "Gérondif passé (forme ancienne) de брюзжать."
      ],
      "id": "fr-брюзжавши-ru-verb-OmJMOiVO",
      "tags": [
        "form-of"
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "брюзжавши"
}

{
  "categories": [
    "Formes de verbes en russe",
    "russe"
  ],
  "forms": [
    {
      "form": "брюзжа́вши",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "брюзжать"
        }
      ],
      "glosses": [
        "Gérondif passé (forme ancienne) de брюзжать."
      ],
      "tags": [
        "form-of"
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "брюзжавши"
}