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.
¶GRIMMASNAG, n. A very gloomy sulky person (Mearns 1822 G. R. Kinloch MS.).
[? Grim, stern, unbending + Snag, snap, snarl.]