1. a person or machine that drills holes
2. a tool or device used for drilling
3. a person who trains others through repetitive practice or exercises
Usage: often used in military or educational contexts

Examples

• The driller carefully positioned the machine before starting the bore.
• A skilled driller can extract oil from deep underground.
• The dental driller removed the decayed portion of the tooth.
• The sergeant was a strict driller who demanded precision from every recruit.
• The construction crew hired an experienced driller for the foundation work.
• The driller made multiple holes in the metal sheet with accuracy.