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Definition of Underhole
1. Verb. To cut away or mine out the lower portion of a coal-seam or a part of the underelay so as to win or get the overlying coal. ¹
¹ Source: wiktionary.com
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1. Verb. To cut away or mine out the lower portion of a coal-seam or a part of the underelay so as to win or get the overlying coal. ¹
¹ Source: wiktionary.com