Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
PLUG, n., v.1 Sc. usages.
I. n. As in Eng., in n.comb. plug-shot, in Mining: “a charge in a small hole to break up a stone of moderate size” (Sc. 1886 J. Barrowman Mining Terms 52).Ayr. 1901 G. Douglas Green Shutters xiii.:
He . . . ground them [words] out like a labouring mill, each word solid as plug shot.
II. v. Sc. Mining usage: to blast rock by means of plug-shots, see above (Sc. 1886 J. Barrowman Mining Terms 52).