Buck"ing, n. 1. The act or process of soaking or boiling cloth in an alkaline liquid in the operation of bleaching; also, the liquid used. Tomlinson.

2. A washing.

3. The process of breaking up or pulverizing ores.

Bucking iron(Mining), a broad-faced hammer, used in bucking or breaking up ores. -- Bucking kier(Manuf.), a large circular boiler, or kier, used in bleaching. -- Bucking stool, a washing block.