waste water
noun [ U ] (US also wastewater) uk/ˈweɪst ˌwɔː.tər/ us/ˈweɪst ˌwɑː.t̬ɚ/
（家里、公司或工厂等排出的）废水
water that is not clean because it has already been used in homes, businesses, factories, etc.
These new eco-friendly homes recycle waste water in toilet cisterns. 这些新型环保住宅利用废水冲厕所。