Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BACKS, n.4 The last liquor to be distilled from a whisky mash.Abd. 1796 Session Papers, Leslie v. Fraser (29 March 1805) 170:
They judged among themselves, that it was the backs or washings of their still pots.
[Poss. an extended use of Backs, n.1]