Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
†LUM, v.2, n.2
I. v. Of rain: to fall in a downpour.Gall. 1824 MacTaggart Gallov. Encycl. 325:
The rain is just coming lumming down.
II. n. In phr. a lum of a day, a very wet day (Ib.).
[Appar. the same word as Midl.Eng. dial. lomb, a downpour, waterfall, phs. also lum(b), a water-hole in a mire, a deep pool, and maybe ultimately of the same orig. as Lum, n.1, v.1]
