DSL - SND1 SHORE, n.3 A sewer, drain. Gen. in phr. the common shore. Obs. in Eng. exc. dial. [o:r]
*Edb.1816 Blackwood's Mag. (May) 202:
Her Luckenbooths now choak the common shore.
*Abd.1853 W. CadenheadFlights 168:
An' for the burn, . . . It has been lang a common shore.
[Prob., as N.E.D. thinks, not a variant of sewer, which gives SYVERin Sc., but an extension of SHORE, n.1, as the dumping ground for rubbish to be carried away by the tide. Cf. 1725 quot. s.v.]