HOLING
Source: 567
Hol″ing (?), n. [[See Hole a hollow.]] (Mining) Undercutting in a bed of coal, in order to bring down the upper mass. Raymond.
Source: 567
Hol″ing (?), n. [[See Hole a hollow.]] (Mining) Undercutting in a bed of coal, in order to bring down the upper mass. Raymond.