noun
a noncommissioned officer who instructs recruits in military marching and discipline
• Syn: ↑drill master
• Topics: ↑military, ↑armed forces, ↑armed services, ↑military machine, ↑war machine
• Hypernyms: ↑noncommissioned officer, ↑noncom, ↑enlisted officer
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drill instructor,
an officer, usually noncommissioned, who drills soldiers in marching, handling guns, and other military maneuvers: »
... the determined enthusiasm of a platoon of boots bent on appeasing an exacting drill instructor (Time).
Useful english dictionary. 2012.