Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
HACK, n.2 A wild rocky stretch of moorland or moss (Gall. 1824 MacTaggart Gallov. Encycl. 250). Still used in place-names (Kcb.10 1955).
[Prob. a variant of Hag, n.1, 3. q.v., under the influence of the semantic relationship between Hag, v.1 and Hack, v.]