blue coat
noun
1- a person who wears a blue coat, in particular穿蓝大衣的人, 尤指：
1.1
- historical a soldier in a blue uniform〈史〉穿蓝色制服的士兵。
1.2
- (Blue Coat) Brit. a student at a charity school with a blue uniform〈英〉（穿蓝色制服的）慈善学校学生。