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.
BRINN, n.2 “The flickering, quivering movement of the air as seen often on a hot day” (Ork. 1929 Marw.).
[Cf. Brin, n.2, a ray, flash. Marw. assigns it to Norw. brign (with meaning as above), from Norw. briga or brega, to flicker.]