IPA: /ˈɡɑrdzˌmæn/
KK: /ˈɡɑrdzˌmæn/
A person who serves as a guard, often in a military or protective role.
The guardsman stood at attention during the ceremony.
Guardsman → It is formed from "guard" (from Old French *guarder*, meaning to protect or watch over) and "-sman" (an Old English suffix meaning a person). A guardsman is therefore a person who protects or watches over something.
Think of someone who is 'watching over' ('guard') and is a 'person' ('-sman') — that's what a guardsman does.