1. a.  A bus, especially one designed for long-distance passenger service.
b.  A railroad passenger car.
c.  A closed automobile, usually with two doors.
d.  A large, closed, four-wheeled carriage with an elevated exterior seat for the driver; a stagecoach.
 4. a.  A person who gives instruction or guidance: an acting coach; a life coach.
b.  A private tutor employed to prepare a student for an examination.