SEWER

[noun] [C] - a large artificial passage or a large pipe, usually underground, which is used for carrying waste water and human waste, such as urine and excrement, away from buildings to a place where they can be safely got rid ofa sewer pipea sewer ratsewer servicesA complicated system of sewers runs under the city.An open sewer is a channel for carrying away waste water and waste from the human body which is above the ground and is not covered.