- underhole
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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.
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underhole
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underhole — | ̷ ̷ ̷ ̷| ̷ ̷ transitive verb Etymology: under (I) + hole : to cut away the lower portion of or to cut under (a coal seam) … Useful english dictionary
