Mining. To undercut (the coal) in a seam so as to release it from the other strata.

transitive. To make a hole in (rock, the ground, etc.); (Mining) to cut holes in (granite or coal) in order to split a body of rock or seam. Also…

Mining. To cut away the under-part of (a vein of ore or a face of coal); to obtain (coal, etc.) in this way.

transitive or intransitive. To undermine; spec. (in coal-mining), to undercut.

transitive. Mining. To cut (a seam) at or near roof level. Also intransitive.

To cut and remove extraneous material from (a thing) with a plough, in any of various technical or… transitive. Coal Mining. To cut (coal) from a…