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 DSL - SND1      SHORE  , n. 3 A sewer, drain. Gen. in phr. the common   shore  . Obs. in Eng. exc. dial. [ʃo:r]  
     *Edb. 1816 Blackwood’s Mag. (May) 202:
     Her Luckenbooths now choak the common   shore  .  
     *Abd. 1853 W. Cadenhead Flights 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 Syver in 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.]