Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
PROG, n.2 “Oil from melted fish-livers which, at the meal, is poured over the fish (esp. small coalfish), or into which the fish is dipped. Also partly denotes the whole serving: fish and potatoes, eaten with melted liver-oil” (Sh. 1908 Jak. (1928), Sh. 1966). Cf. Eng. slang prog, food, “grub”. [pro:g]
