Jisho

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Godan verb with 'ru' ending, Intransitive verb
1. to go upstream; to go up (a river)Usually written using kana alone
Godan verb with 'ru' ending, Intransitive verb
2. to go back (to the past or origin); to date back (to); to trace back (to); to be retroactive (to)Usually written using kana alone
Other forms
溯る 【さかのぼる】逆上る 【さかのぼる】泝る 【さかのぼる】
Notes
溯る: Rarely-used kanji form. 逆上る: Rarely-used kanji form. 泝る: Rarely-used kanji form.

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