holing


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Related to holing: holing out, called off

holing

[′hōl·iŋ]
(mining engineering)
The working of a lower part of a bed of coal to bring down the upper mass.
The final act of connecting two workings underground.
The meeting of two mine roadways driven to intersect. Also known as thirling.

holing

The punching of holes in slates before fixing on a roof.