·p.pr. & ·vb.n. of Tub.
II. Tubbing ·noun The forming of a tub; also, collectively, materials for tubs.
III. Tubbing ·noun 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.