Source : Webster's Revised Unabridged Dictionary (1913)

Sewer \Sew"er\, n. [OF. sewiere, seuwiere, ultimately fr. L. ex
   out + a derivative of aqua water; cf. OF. essevour a drain,
   essever, esseuwer, essiaver, to cause to flow, to drain, to
   flow, LL. exaquatorium a channel through which water runs
   off. Cf. {Ewer}, {Aquarium}.]
   A drain or passage to carry off water and filth under ground;
   a subterraneous channel, particularly in cities.

Sewer \Sew"er\, n. [Cf. OE. assewer, and asseour, OF. asseour,
   F. asseoir to seat, to set, L. assidere to sit by; ad +
   sedere to sit (cf. {Sit}); or cf. OE. sew pottage, sauce,
   boiled meat, AS. se['a]w juice, Skr. su to press out.]
   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.

         Then the sewer Poured water from a great and golden
         ewer, That from their hands to a silver caldron ran.
                                                  --Chapman.

Sewer \Sew"er\, n.
   1. One who sews, or stitches.

   2. (Zo["o]l.) A small tortricid moth whose larva sews
      together the edges of a leaf by means of silk; as, the
      apple-leaf sewer ({Phoxopteris nubeculana})

Source : WordNet®

sewer
     n 1: a waste pipe that carries away sewage or surface water [syn:
           {sewerage}, {cloaca}]
     2: someone who sews; "a sewer of fine gowns"
     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" [syn: {gutter}, {toilet}]