drilling
- n the act of drilling
- n the act of drilling a hole in the earth in the hope of producing petroleum
- v make a hole, especially with a pointed power or hand tool
- v train in the military, e.g., in the use of weapons
- v learn by repetition
- v teach by repetition
- v undergo military training or do military exercises
drilling fluid
- n a mixture of clays and chemicals and water; pumped down the drill pipe to lubricate and cool the drilling bit and to flush out the cuttings and to strengthen the sides of the hole