IPA: /ˈkɔːl.bɔɪ/
KK: /ˈkɔlˌbɔɪ/
A person, usually male, who performs various tasks such as assisting guests in hotels, providing companionship, or notifying performers when it's their turn to go on stage.
The callboy helped the guests with their luggage and made sure the performers were ready for their show.
Callboy → The word is formed from "call" (from Old English "ceallian", meaning to cry out or shout) and "boy" (from Old English "bōia", meaning a young male). A callboy is someone who calls out or announces, typically in a theatrical context.
Think of someone who 'cries out' or 'calls' ('call') and is a 'young male' ('boy') — that's what a callboy does.