cornerman

plural cornermen

1. boxingA coach, trainer or other assistant who attends to a boxer between rounds.
2. ball gamesA player who can play both the small forward and power forward positions.

   Synonyms: corner

3. UShistoricalA policeman assigned to an intersection to direct the traffic.

   This cornerman is taking time out to provide directions to a driver. Their easily recognizable white hats and regular presence on their corners made these officers readily accessible […]

   2011, Daniel F. Walsh, Thomas L. Derby, Russell W. Gates, Syracuse Police, page 113

4. Synonym of endman (“type of stock minstrel character”).

   Synonyms: endman