Jisho

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Noun, Suru verb, Intransitive verb
1. going upstream; sailing against the current
Other forms
溯行 【そこう】遡航 【そこう】溯航 【そこう】
Notes
溯行: Rarely-used kanji form. 遡航: Rarely-used kanji form. 溯航: Rarely-used kanji form.

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