top·per
noun/ˈtɒpə(r)/
/ˈtɑːpər/
(informal)- a top hat (= a man’s tall black or grey hat, worn with formal clothes on very formal occasions)
高顶礼帽（=男士高高的黑色或灰色帽子，在非常正式的场合与正式服装一起佩戴） - (Indian English) a student who gets the highest results in the class
尖子生；成绩最好的学生