1. Godan verb with 'ru' ending, Intransitive verb

   1.

   to go upstream; to go up (a river)

2. 2.

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

Example sentences

• 映画は第二次世界大戦に遡る。

  The film takes us back to World War II.

• 私は自分の祖先を200年遡ることができる。

  I can trace my ancestors back 200 years.