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a. A channel cut along the side of a mine shaft to conduct the water back
into a lodge or sump.
b. A process of quarrying stone in which channels, several inches wide,
are cut by hand tools, and the stone block detached from the bed by pinch
bars.
c. The formation of more or less vertical breaks at or toward the
centerline of a roadway, as a consequence of which falls occur along the
groove or gutter. TIME
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