Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BULL-SHOT, n.comb. Also in reduced form buller. In Mining: a blown-out shot, a shot which blows backwards without breaking the coal (Sc. 1886 J. Barrowman Mining Terms 14). Cf. Bulling. [Orig. obscure.]