Sewer

n. drainage pipe, pipe that carries away waste water; tailor, one who sews

A sewer is an artificial conduit (or pipe) or system of conduits used to remove sewage (human liquid waste) and to provide drainage. In the 20th century developed world, sewers are usually pipelines that begin with connecting pipes from buildings to one or more levels of larger underground horizontal mains, which terminate at sewage treatment facilities. Vertical pipes, called manholes, connect the mains to the surface. Sewers are generally gravity powered, though pumps may be used if necessary.
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Noun
1. a waste pipe that carries away sewage or surface water
(synonym) sewerage, cloaca
(hypernym) drain, drainpipe, waste pipe
(part-holonym) sewage system, sewer system, sewage works
2. someone who sews; "a sewer of fine gowns"
(hypernym) needleworker
(hyponym) baster, tacker
(derivation) sew, tailor, tailor-make
3. misfortune resulting in lost effort or money; "his career was in the gutter"; "all that work went down the sewer"; "pensions are in the toilet"
(synonym) gutter, toilet
(hypernym) misfortune, bad luck, tough luck, ill luck

(n.)
One who sews, or stitches.
  

(n.)
Formerly, an upper servant, or household officer, who set on and removed the dishes at a feast, and who also brought water for the hands of the guests.
  

(n.)
A small tortricid moth whose larva sews together the edges of a leaf by means of silk; as, the apple-leaf sewer (Phoxopteris nubeculana)
  

(n.)
A drain or passage to carry off water and filth under ground; a subterraneous channel, particularly in cities.
  

A channel or conduit that carries wastewater and storm-water runoff from the source to a treatment plant or receiving stream. "Sanitary" sewers carry household, industrial, and commercial waste. "Storm" sewers carry runoff from rain or snow. "Combined" sewers handle both.