1 [count] a : a person who teaches and trains an athlete or performer
▪ a track/tennis star who has been working with a new coach ▪ a vocal/voice/drama coach
b : a person who teaches and trains the members of a sports team and makes decisions about how the team plays during games
▪ a football/basketball/soccer coach 2 [count] Brit : a private teacher who gives someone lessons in a particular subject 3 : a large four-wheeled vehicle that is pulled by horses : carriage [count] ▪ In those days, people usually traveled long distances in coaches. [noncount] ▪ traveling by coach — see also stagecoach 4 chiefly Brit : a large bus with comfortable seating that is used for long trips [count] ▪ The company hired two coaches for the trip. [noncount] ▪ We traveled by coach to London. — often used before another noun ▪ a coach driver/tour/party 5 [noncount] US : the section of least expensive seats on an airplane or train
▪ We reserved two seats in coach. ▪ I usually fly coach, but on this trip I'm flying first-class. — often used before another noun ▪ coach fares/passengers/seats 6 [count] Brit : a separate section of a train
▪ a passenger coach [=(US) car, (Brit) carriage]