げすい 下水 Common word JLPT N2 LinksSentence search for 下水Sentence search for げすいKanji details for 下 and 水Edit in JMdict Noun1. drainage; ditch; gutter; sewerageげすい下水がかんぜん完全につま詰まっている。The drains are blocked up.Noun2. sewage; black water Discussions Log in to talk about this word.