"歳々年々" meaning in Japanese

{
  "forms": [
    {
      "form": "歳々年々",
      "ruby": [
        [
          "歳",
          "さい"
        ],
        [
          "々",
          "さい"
        ],
        [
          "年",
          "ねん"
        ],
        [
          "々",
          "ねん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "saisainennen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "adverb",
        "2": "さいさいねんねん"
      },
      "expansion": "歳(さい)々(さい)年(ねん)々(ねん) • (saisainennen)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "year in, year out"
      ],
      "id": "en-歳々年々-ja-adv-CAbivJ5V",
      "links": [
        [
          "year in, year out",
          "year in, year out"
        ]
      ]
    }
  ],
  "word": "歳々年々"
}

{
  "forms": [
    {
      "form": "歳々年々",
      "ruby": [
        [
          "歳",
          "さい"
        ],
        [
          "々",
          "さい"
        ],
        [
          "年",
          "ねん"
        ],
        [
          "々",
          "ねん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "saisainennen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "adverb",
        "2": "さいさいねんねん"
      },
      "expansion": "歳(さい)々(さい)年(ねん)々(ねん) • (saisainennen)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Japanese adverbs",
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with hyōgaiji kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with 々",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with four Han script characters"
      ],
      "glosses": [
        "year in, year out"
      ],
      "links": [
        [
          "year in, year out",
          "year in, year out"
        ]
      ]
    }
  ],
  "word": "歳々年々"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "歳々年々"
  ],
  "section": "Japanese",
  "subsection": "adverb",
  "title": "歳々年々",
  "trace": ""
}