noun one who sews, or stitches.
2. sewer ·noun a drain or passage to carry off water and filth under ground; a subterraneous channel, particularly in cities.
3. sewer ·noun a small tortricid moth whose larva sews together the edges of a leaf by means of silk; as, the apple-leaf sewer (phoxopteris nubeculana).
4. sewer ·noun 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.