Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II). Includes material from the 1976 supplement.
This entry has not been updated since then but may contain minor corrections and revisions.
BLUE-BORE, n. “A rift in the clouds” (Bnff.2, Abd.2, Abd.9 1935). See also Bore, n.1, (4).Sc. 1846 Anon. The Muckomachy (based on W. Drummond Polemo-Middinia) 42:
If chance the pack'd clouds, in their flight, Open a blue-bore in the sky.