E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A private tutor. The term is a pun on getting on fast. To get on fast you take a coach, you cannot get on fast without a private tutorergo, a private tutor is the coach you take in order that you may get on quickly. (University slang.)
The books are expensive, and often a further expense is entailed by the necessity of securing a coach.Stedman Oxford, chap. x. p. 188.
To dine in the coach. In the captains private room. The coach or couch of a ship is a small apartment near the stern, the floor being formed of the aftmost part of the quarter-deck, and the roof by the poop.
A slow coach. A dull, unprogressive person, somewhat fossilised.
What a dull, old-fashioned chap thou best but thou wert always a slow-coach.Mrs. Gaskell: Cibbie Marsh (Era 2).