Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
¶UNSWACK, adj. Stiff, not agile or nimble. Used adv. in quot. See Swack, adj., 2.Abd. 1801 W. Beattie Parings (1873) 6:
I gade o'er nae that unswack.