"五十日の祝" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 成句",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "五十日（いか）の祝（いわい",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "いか"
    },
    {
      "form": "いわい"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "phrase",
  "pos_title": "成句",
  "related": [
    {
      "word": "産養い"
    },
    {
      "word": "宮参り"
    },
    {
      "word": "初節句"
    }
  ],
  "senses": [
    {
      "glosses": [
        "子供が生まれて五十日目に行う祝い事。五十日の餅を赤子の口に含ませる。"
      ],
      "id": "ja-五十日の祝-ja-phrase-T~ruDCFF"
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "五十日の祝"
}

{
  "categories": [
    "日本語",
    "日本語 成句"
  ],
  "forms": [
    {
      "form": "五十日（いか）の祝（いわい",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "いか"
    },
    {
      "form": "いわい"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "phrase",
  "pos_title": "成句",
  "related": [
    {
      "word": "産養い"
    },
    {
      "word": "宮参り"
    },
    {
      "word": "初節句"
    }
  ],
  "senses": [
    {
      "glosses": [
        "子供が生まれて五十日目に行う祝い事。五十日の餅を赤子の口に含ませる。"
      ]
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "五十日の祝"
}