IPA: /ˈbɔːlˌbɔɪ/
KK: /bɔlˌbɔɪ/
A person, usually a young boy, who retrieves and delivers balls during a sports game, especially in tennis or basketball.
The ballboy quickly ran to fetch the tennis ball that had rolled away.
Ballboy → The word is formed from "ball" (from Old English *beall*, meaning a spherical object used in games) and "boy" (from Old English *bōia*, meaning a young male). A ballboy is a young male who retrieves and delivers balls during a game.
Think of a young male ('boy') who is responsible for handling the spherical objects ('ball') during a game.