IPA: /ˈmɑːrksmən/
KK: /ˈmɑrksmən/
A person who is very skilled at shooting accurately at targets, especially with a rifle.
The marksman hit the target from a long distance away.
Marksman → It is formed from "mark" (from Old English "mearc", meaning boundary or target) and "-sman" (meaning a person who). A marksman is a person who is skilled at hitting a target.
Think of someone who is skilled at hitting a 'target' ('mark') — that's what a marksman is.