Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
DAGG, n. “A cut of earth” (Gall. 1824 MacTaggart Gallov. Encycl. 157); “a section in the depth of a drain or of a level in mining” (Kcb.4 c.1900).
[Cf. obs. Eng. dag, to cut the edge of (a garment) into long pointed jags; to slash (N.E.D.).]