Coal-mining. [UP- 2 b + BROW sb.1 8.] (See quots.)
1867. W. W. Smyth, Coal & Coal-mining, 135. The bays … will be connected with the main roads by pairs of drifts (up-brows) carried up the rise of the seam; or sometimes … by down-brows.
1883. Gresley, Gloss. Coal-m., 268. Up-brow, an inclined plane worked to the rise.
