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.
†GRUMSHACH, adj., n.
I. adj. Surly, morose (Mry. 1 1925; Uls.3 1930).
II. n. One who grumbles (Mry.1 1925).
[Grum, adj., 1. or grump + -ish + -ach.]