Tubbing

ជាទម្រង់ Gerund ឬ Present Participle នៃ tub

1.

The forming of a tub; also, collectively, materials for tubs.

2.

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.