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.
†SLACK, v.2 To damp down (a fire) by covering it with slack or coal dross (Per. 1825 Jam.).
[Appar. not used as a v. in Eng. Phs. there has been influence from Slack, v.1 and Slock.]