さかのぼる

遡る

表記・読み：溯る・逆上る・泝る・さかのぼる

1. 1

   to go upstream; to go up (a river)

   五段動詞（る）自動詞word usually written using kana alone
2. 2

   to go back (to the past or origin); to date back (to); to trace back (to); to be retroactive (to)

   五段動詞（る）自動詞word usually written using kana alone