A "sideline reporter" is a person who provides updates and information about a sports game or event from the sidelines, like a journalist or announcer. Full definition
In 2004, she got her big break — a reporting job on ESPN National Hockey Night — and has since become a favorite sideline reporter for college football, the NFL and Major League Baseball. (health.com)
Teachers re-outfit themselves as sideline reporters, monitoring, questioning and analyzing the action, while the quickest and slowest students suddenly discover themselves in supporting and leading roles they never quite imagined. (edutopia.org)
Last week, Michigan State head coach Mark Dantonio told ESPN sideline reporter Quint Kessenich to ask him a different question after Kessenich asked a question that Dantonio didn't like. (diehardsport.com)