Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
UNSKREWED, ppl.adj. Of corn: not built up into stacks. See Scroo, v.Sh. 1785 Diary J. Mill (S.H.S.) 76:
Most of the corns lay unskrewed.