southen sean.Scottish (Shetland) (in Papa Stour) a heavy sea driven by a south-westerly gale against the south-west coast.
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2010 G. P. S. PetersonLet. 6 Apr. (O.E.D. Archive) In Papa reference can also be made to ‘Da southeen sea’, coming from the SW, roughly past the island of Foula... There is a heavy Atlantic swell with a southeen sea, which can run for days at a time.