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In coal-mining, a, long gash cut under a mass of coal in “holing,” “kirving,” “benching,” or “undercutting” it, so that it may afterward fall, or be wedged or blasted down.
(noun)
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In quarrying, a long deep hole made in quarrying soft rock for building purposes, whether the gash is horizontal or vertical.
(noun)
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In coal-mining and quarrying, to undercut; form a jad in.
The Century Dictionary (Public Domain)