sergeant major

Từ điển Oxford Advanced Learner 8th

ˌsergeant ˈmajor [sergeant major sergeant majors] BrE NAmE noun
(often used as a title)
1. a soldier of middle rank in the British army who is responsible for helping the officer who organizes the affairs of a particular ↑regiment (= a large group of soldiers)
•Sergeant Major Phillips
2. a soldier in the US army of the highest rank of ↑non-commissioned officers