cover hole

cover hole

[′kəv·ər ‚hōl]
(mining engineering)
One of a group of boreholes drilled in advance of mine workings to probe for and detect water-bearing fissures or structures.
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References in periodicals archive ?
The Midlands, of course, was the industrial forge of heavy metal, and Hetfield dedicated Black Sabbath cover Hole In The Sky to Tony Iommi, who sat in the front row.
Place a plastic lid in bottom of pot to cover hole.
Mark the cover hole on the tile and cut it out with an abrasive blade in a jigsaw.
All pontoons shall have a two-inch (2") hole at one end with a two-inch (2") plug to cover hole.
Roof decking had been completed, with plywood sheeting used to cover holes until proper lids were fitted.
Why do we have to mortgage this wealth today in order to cover holes in public finances?
Cyprus will request the amount of EUR 11 B for a bailout to recapitalize its bank system and cover holes in its budget, according to sources quoted by the Bloomberg agency.
Solder mask generally isn't put down with enough precision to cover holes on tiny pads, and further, the solder mask would probably mess with the clearance, especially with very small QFNs, Immersion silver finishes may develop corrosion in sealed vias.