sewer (n.1)

c. 1400, "conduit," from Anglo-French sewere, Old North French sewiere "sluice from a pond" (13c.), literally "something that makes water flow," from shortened form of Gallo-Roman *exaquaria (source of Middle French esseveur), from Latin ex "out" (see ex-) + aquaria, fem. of aquarius "pertaining to water," from aqua "water" (from PIE root *akwa- "water").

Specifically of underground channels for wastewater from c. 1600; figurative use of this is from 1640s.

sewer (n.2)

"one who sews," late 14c., agent noun from sew (v.).

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Definitions of sewer

sewer (n.)
a waste pipe that carries away sewage or surface water;
Synonyms: sewerage / cloaca
sewer (n.)
someone who sews;
a sewer of fine gowns
sewer (n.)
misfortune resulting in lost effort or money;
all that work went down the sewer
Synonyms: gutter / toilet