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.
BONFROST, Bon, n. (See quot.)Sh. 1908 Jak. (1928); 1914 Angus Gl.:
Bonfrost, very severe frost, prop. when water freezes to the bottom. . . . In the expr. “to freeze lek [like] de bon,” to freeze very hard, bon is certainly an abbr. of bonfrost.
