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.
SLUFF, v. Also sluf(s), slufter. To make a noise in drinking, to drink in noisy gulps, to slobber (Sh. 1908 Jak. (1928), sluf, Sh. 1970). [slʌf]
[Sh. variant form of Sloch, v.2, or poss. orig. simply imit. Cf. obs. or dial. Eng. sloff, to eat greedily.]