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かのぼ遡る溯る逆上るIntransitiveUsually kanaGodan verbFreq #9473
1

to go upstream; to go up (a river)

Examples
鮭は川をさかのぼって砂に産卵する。
Salmon go up the river and lay their eggs in the sand.
2

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

Examples
その教会は1173年までさかのぼる
The church dates back to 1173.