Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
†COUPAL, n. (See quot.)Bnff. 1880 J. F. S. Gordon Chrons. of Keith 418:
A piece of small cord was firmly tied round a sheep's foot (causing lameness). It was said to be an incurable disease called the Coupal. (This trick was done by the men servants to get mutton for their own use.)