What does 汚水 mean?
汚水 is a Japanese noun meaning “dirty water” in English. It is written as 汚水 in kanji, おすい in hiragana, and osui in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
そして汚水を流すために地下に下水道を持っていた。
The house has pipes under the ground to carry dirty water away.