1 bore, penetrate, pierce, cut a hole:
The thieves drilled into the safe.
2 rehearse, train, practise, exercise, teach, instruct, school, tutor, coach, indoctrinate; discipline:
We were thoroughly drilled in the Latin conjugations and declensions.
3 auger, (brace and) bit, gimlet:
The bit for this drill is no longer sharp.
4 practice, training, repetition, exercise, rehearsal; discipline:
Tomorrow there will be a complete drill of the parts of speech.