1.
sewage, wastewater
Dirty water that flows from houses and buildings into drains.
2.
sewer, drainage system
The system of pipes and channels that carries away sewage.
下水 refers to sewage (wastewater) or the sewer system that carries it away.
Common collocations:
- 下水道 (sewer system)
- 下水処理 (sewage treatment)
- 下水処理場 (sewage treatment plant)
- 下水が流れる (sewage flows)
Antonym: 上水 (clean water, tap water supply)
Related Words
Antonym:
上水 (clean water supply)