Etymology
Advertisement
coach (n.)

1550s, "large kind of four-wheeled, covered carriage," from French coche (16c.), from German kotsche, from Hungarian kocsi (szekér) "(carriage) of Kocs," village where it was first made. In Hungary, the thing and the name for it date from 15c., and forms are found since 16c. in most European languages (Spanish and Portuguese coche, Italian cocchino, Dutch koets). Vehicles often were named for the place of their invention or first use (compare berlin, landau, surrey). Applied to railway passenger cars by 1866, American English. Sense of "economy or tourist class" is from 1949.

Meaning "instructor/trainer" is c. 1830 Oxford University slang for a private tutor who "carries" a student through an exam (compare pony in the student slang sense "translation"). Transferred sense in sports, "person employed to train athletes for a contest" is attested from 1861. A more classical word for an athletic trainer was agonistarch, from Greek agonistarkhes "one who trains (someone) to compete in the public games and contests."

All panelled carriages with seats for four persons inside, and an elevated coachman's seat, are designated coaches. The town coach proper, has windows in the doors, and one in each end, the quarters being panelled. [Henry William Herbert ("Frank Forester"), "Hints to Horse-Keepers," New York, 1859]
Related entries & more 
Advertisement
coach (v.)

1610s, "to convey in a coach," from coach (n.). Meaning "to tutor, give private instruction to, prepare (someone) for an exam or a contest" is from 1849. Related: Coached; coaching.

Related entries & more 
coach-horse (n.)

"horse used or suitable for driving a coach," c. 1600, from coach (n.) + horse (n.).

Related entries & more 
coach-box (n.)

"seat on which the driver of a coach sits," 1650s, from coach (n.) + box (n.).

Related entries & more 
coach-maker (n.)

also coachmaker, "a maker of (horse-drawn) coaches," 1590s, from coach (n.) + maker.

Related entries & more 
Advertisement
coachman (n.)

"man who drives a coach," 1570s, from coach (n.) + man (n.).

Related entries & more 
coaching (n.)

1825, "the use of a coach as a public conveyance;" 1849 as "special instruction or training for an exam or an athletic contest;" verbal noun from coach (v.). 

Related entries & more 
stagecoach (n.)

also stage-coach, 1650s, from stage (n.) in a sense of "division of a journey without stopping for rest" (c. 1600) + coach (n.).

Related entries & more 
porte-cochere (n.)

"gateway for carriages in a building, leading from the street to an interior court," 1690s, from French porte-cochère, from porte "gate" (from Latin porta, from PIE root *per- (2) "to lead, pass over") + cochère, fem. adjective from coche "coach" (see coach (n.)).

Related entries & more 
mailbox (n.)

also mail-box, 1797, "box for mailbags on a coach," from mail (n.1) + box (n.1). Meaning "letterbox, box placed in some public place for the deposit of letters to be gathered by the postman," is by 1853, American English.

Related entries & more