Drill v. t. [imp. & p. p. Drilled p. pr. & vb. n. Drilling.]
1. To pierce or bore with a drill, or a with a drill; to perforate; as, to drill a hole into a rock; to drill a piece of metal.
2. To train in the military art; to exercise diligently, as soldiers, in military evolutions and exercises; hence, to instruct thoroughly in the rudiments of any art or branch of knowledge; to discipline.
He [Frederic the Great] drilled his people, as he drilled his grenadiers. -- Macaulay.
adj : trained in a skill by repetitious practice; "well-drilled in