Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
SIBSTER, prop.n. In phr. Sibster's grace, see quot.Cai. 1916 J. Mowat Proverb 4:
“Ye can say Sibster's grace” is spoken of one who has taken a very substantial diet, but we have lost trace of Sibster or the substance of his grace.