"反古" 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": "ほご"
    },
    {
      "form": "古:ほぐ"
    },
    {
      "form": "ほうご"
    },
    {
      "form": "ほうぐ"
    },
    {
      "form": "ほんご"
    },
    {
      "form": "ほんぐ"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "glosses": [
        "書き損じた不用な紙。"
      ],
      "id": "ja-反古-ja-noun-T0oUQQ1Y"
    },
    {
      "glosses": [
        "不用なもの。役に立たないもの。"
      ],
      "id": "ja-反古-ja-noun-S0qZ8PQ8"
    },
    {
      "examples": [
        {
          "text": "コロケーション:反古にする、反古になる"
        }
      ],
      "glosses": [
        "無効、取り消し。"
      ],
      "id": "ja-反古-ja-noun-fIT6EHI6"
    }
  ],
  "word": "反古"
}

{
  "categories": [
    "日本語",
    "日本語_名詞"
  ],
  "forms": [
    {
      "form": "ほご"
    },
    {
      "form": "古:ほぐ"
    },
    {
      "form": "ほうご"
    },
    {
      "form": "ほうぐ"
    },
    {
      "form": "ほんご"
    },
    {
      "form": "ほんぐ"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "glosses": [
        "書き損じた不用な紙。"
      ]
    },
    {
      "glosses": [
        "不用なもの。役に立たないもの。"
      ]
    },
    {
      "examples": [
        {
          "text": "コロケーション:反古にする、反古になる"
        }
      ],
      "glosses": [
        "無効、取り消し。"
      ]
    }
  ],
  "word": "反古"
}