IPA: /ˈkɔːrnərˌmæn/
KK: /ˈkɔrnərˌmæn/
A person who helps a boxer during a match, especially between rounds, by providing advice and support.
The cornerman quickly checked the boxer's injuries and gave him advice before the next round.
Cornerman → It is formed from "corner" (from Old French *corniere*, meaning the angle or edge of something) and "man" (from Old English *mann*, meaning a human being). A cornerman is a person who is positioned in the corner of a boxing ring or similar setting, typically to assist a fighter.
Think of someone positioned in the 'corner' of a boxing ring, ready to help — that's what a cornerman does.