noun

• (rail transport, UK, Australia) A passenger car, either drawn by a locomotive or part of a multiple unit.
• (originally Oxford University slang) A trainer or instructor.
  "football coach"
• (British, Australia) A long-distance, or privately hired, bus.
• (nautical) The forward part of the cabin space under the poop deck of a sailing ship; the fore-cabin under the quarter deck.
  "The commanders all came on board and the council sat in the coach."

verb

• (intransitive, sports) To train.
• (transitive) To instruct; to train.
  "She has coached many opera stars."
• (intransitive) To study under a tutor.
• (intransitive) To travel in a coach (sometimes coach it).
  "Affecting genteel fashions, coaching it to all quarters"

adv

• (chiefly US) Via the part of a commercial passenger airplane or train reserved for those paying the lower standard fares; via the economy section.
  "John flew coach to Vienna, but first-class back home."