This site will be taken down March 31st, 2026.

This was not an easy decision to make. For the last couple years, I have been struggling to find motivation for this site and to keep up with basic maintenance and security updates. With the rise of AI and more sophisticated tools, the usefulness of sites like this is questionable and traffic has nose-dived. I just don't have it in me to keep doing this. Thank you all for 10 years of support!

Zach

Word

遡る

溯る、逆上る、泝る
さかのぼる
to go upstream; to go back (in time, to origin); to date back to; to trace back to; to make retroactive
Word

遡河魚

溯河魚
そかぎょ、さっかぎょ
anadromous fish (fish that migrates upstream, e.g. salmon)
Word

遡及

溯及
さっきゅう、そきゅう
tracing back; retroactivity
Word

遡源

溯源
さくげん、そげん
returning to the origin; going back to the beginning; retracing
Word

遡行

溯航、遡航
そこう
going upstream; sailing against the current