Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
ROIL, v. To rub (herring) with salt before packing. Also in Manx dial.Arg. 1914 J. M. Hay Gillespie II. ix.:
I never saw herrin' roiled that wy before.
