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.