Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
GRUM, n.1 [grum]
1. Dregs (Cai. 1940 John o' Groat Jnl. (19 Jan.)); grounds, e.g. tea-leaves (Sh. 1955).
2. “A number of small objects” (Sh. 1908 Jak. (1928)), gen. applied to very small potatoes (Jak.; Cai. 1940 John o' Groat Jnl. (19 Jan.), Cai. 1955).
[Norw. grums, sediment, grounds.]