Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BOST, n.2 “A short spell of bad weather” (Sh. 1908 Jak. (1928); 1914 Angus Gl.).
[Allied to Norw. bausta, and busta, to rush violently on (Jak.).]
