When dealing with teachers, bosses, someone who is older, seniors, one should never call them by their names.

一个人对老师、上司﹐对比自己年纪大、资格老的人﹐绝对不能直呼其名。

youdao

A leatherneck or a grunt do not sound like nice names to call someone.

VOA: special.2010.03.07