(construction) A fastener that taps and drills its own hole during application.

Not mentioning the names of miscreants will prevent them from getting into trouble.

Alternative spelling of drill and bass

plural of self-drilling screw

Alternative form of extended order drill

Alternative form of close order drill

(military) Practice in marching, formations, and formal handling of arms carried out standing shoulder-to-shoulder and at attention.

(military) Practice in battle formations and maneuvers.

One who trains others in something. / (military) A person who instructs in marching drill.

One who drills. / A person in charge of a drilling rig. / A performer of drill music.