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.
†GRUTTIK, n. The ebb-tide (Sh. 1899 J. Spence Folk-Lore 120).
[A deriv. in -ek of Sh. Norn gratta, grotti (Jak.), O.N. grǫftr, a digging. For sim. development cf. Grefster.]