tubbing

Noun

 * 1) The forming of a tub.
 * 2) Collectively, materials for tubs.
 * 3) A bath taken in a tub.
 * 4) A lining of timber or metal around the shaft of a mine, especially a series of cast-iron cylinders bolted together, used to enable those who sink a shaft to penetrate quicksand, water, etc., with safety.
 * 5) A hazing ritual in which the victim's head is held underwater.
 * 6) The activity of rowing in crudely-made boats.