Definition of drills:
(v) :
to create a
hole by removing material with a drill (1); to practice, especially in a military context
"drill a small hole to start the screw in the right direction."
(n) :
a
tool used to remove material so as to create a
hole, typically by plunging a rotating cutting
bit into a stationary
workpiece; the portion of a drilling tool that drives the bit
"wear safety glasses when operating an electric drill."