coacher

Vose, with a coacher racing along beside him, sped for home.

The coacher on third base will shout at the runner on a short hit to the outfield, “Take your turn!”

Heres the head of the list, called a coacher, as Crispin squared himself in the batters box.

He must not, however, allow the remarks of coacher or spectators to cause him to become rattled or confused.