IPA: /ˈɡeɪtˌmæn/
KK: /ˈɡeɪtˌmæn/
A person who is responsible for controlling access to a gate, often checking who can enter or leave a place.
The gateman checked the visitor's ID before allowing him to enter the premises.
Gateman → It is formed from "gate" (from Old English *geat*, meaning an opening or entrance) and "man" (from Old English *mann*, meaning a person). A gateman is a person who is responsible for a gate or entrance.
Think of a 'gate' as an entrance and 'man' as a person — a gateman is someone who oversees that entrance.