Scottish National Dictionary (1700–)
BOSS, v. “To hole or undercut” (Sc. 1886 J. Barrowman Sc. Mining Terms 11).
Hence bossing, vbl.n. (see quot.).
Bossing, the holing or undercutting of a thick seam, as of limestone, the height of the undercutting being sufficient for a man to work in.
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"Boss v.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 15 Dec 2017 <http://www.dsl.ac.uk/entry/snd/boss_v>
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