a soldier who is a member of a unit called `the guard' or `guards'
guardsman详细解释
guards.man n.（名词）A person who acts as a guard.卫士：担当哨兵工作的人A National Guardmember.国民警卫队队员Chiefly British A soldier in a regiment of household guards.【多用于英国】 禁卫军士兵：皇家禁卫军团中的士兵
