JMdict: 1693670

遡行 【そこう】

  1. [n,vs,vi] going upstream; sailing against the current
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
遡 Go Upstream, Retrace The Past ソ, サク さかのぼ.る
行 Going, Journey, Carry Out, Conduct, Act, Line, Row, Bank コウ, ギョウ, アン い.く, ゆ.く, -ゆ.き, -ゆき, -い.き, -いき, おこな.う, おこ.なう 2