What is the meaning of Holing?

(n.) Undercutting in a bed of coal, in order to bring down the upper mass.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). holing. Retrieved September 20, 2026, from http://smartdefine.org/holing/definitions/2016961
ChicagoWebster's. 2011. "holing" http://smartdefine.org/holing/definitions/2016961 (accessed September 20, 2026).
HarvardWebster's 2011, holing, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/holing/definitions/2016961>.
MLAWebster's. "holing" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/holing/definitions/2016961>