a. To cut away or mine out the lower portion of a coal seam or a part of the underclay so as to win or get the overlying coal. Craigie
b. To mine out a portion of the bottom of a seam, by pick or powder, thus leaving the top unsupported and ready to be blown down by shots, broken down by wedges, or mined with a pick or bar. In England, the terms jad, hole, undercut, kirve, and bench are synonymous. See also: undermine; undercut. Fay
Source:
Dictionary of Mining, Mineral, and Related Terms












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