ETYM French coche, from Italian cocchio, dim. of cocca little boat, from Latin concha mussel, mussel shell.
1. A carriage pulled by four horses with one driver; SYN. four-in-hand, coach-and-four.
2. A person who gives private instruction (as in singing or acting); SYN. private instructor, tutor.

1. One that trains
2. One (as a machine or vehicle) used in training
3. A person who treats the ailments and minor injuries of the members of an athletic team
4. One who trains other persons or animals.