1375-1425;late Middle Englishsuer(e) < dialectal Old Frenchse(u)wiere overflow channel (compare Old Frenchess(e)ouer(e) ditch) < Latin*exaquāria drain for carrying water off, equivalent to Latinex-ex- + aqu(a) water + -āria, feminine of -ārius-ary; see sew2, -er2
"conduit," 1402, from Anglo-Fr. sewere, O.N.Fr. sewiere "sluice from a pond" (13c.), lit. "something that makes water flow," from aphetic form of Gallo-Romance *exaquaria (cf. M.Fr. esseveur), from L. ex- "out" + aquaria, fem. of aquarius "pertaining to water," from aqua "water."