Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
CUSTOCK, n. “Cold mashed potatoes, cut in slices and fried, a dish offered when soup or meat is absent or scarce” (Bnff. 1932 N. K. Wilson in Scotsman (22 Sept.) 15).