"下二段活用" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 名詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "しもにだんかつよう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "related": [
    {
      "word": "動詞"
    },
    {
      "word": "五段活用"
    },
    {
      "word": "四段活用"
    },
    {
      "word": "上一段活用"
    },
    {
      "word": "上二段活用"
    },
    {
      "word": "下一段活用"
    },
    {
      "word": "変格活用"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "日本語 文法",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "古典日本語の動詞の活用の一種。現代日本語では下一段活用に合流した。"
      ],
      "id": "ja-下二段活用-ja-noun-4TklfkSP",
      "topics": [
        "grammar"
      ]
    }
  ],
  "word": "下二段活用"
}

{
  "categories": [
    "日本語",
    "日本語 名詞"
  ],
  "forms": [
    {
      "form": "しもにだんかつよう"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "related": [
    {
      "word": "動詞"
    },
    {
      "word": "五段活用"
    },
    {
      "word": "四段活用"
    },
    {
      "word": "上一段活用"
    },
    {
      "word": "上二段活用"
    },
    {
      "word": "下一段活用"
    },
    {
      "word": "変格活用"
    }
  ],
  "senses": [
    {
      "categories": [
        "日本語 文法"
      ],
      "glosses": [
        "古典日本語の動詞の活用の一種。現代日本語では下一段活用に合流した。"
      ],
      "topics": [
        "grammar"
      ]
    }
  ],
  "word": "下二段活用"
}