coxswain

noun

1. In a ship's boat, the helmsman given charge of the boat's crew.
2. The member of a crew who steers the shell and coordinates the power and rhythm of the rowers.
3. (archaic)The second or third mate of a vessel, in charge of the master's barge.
4. A rank or position.

   “Canadian Navy Coxswain (or Capitaine d'Armes) is the senior non-commissioned officer aboard a ship”

   “British Royal Navy Cadets Cadet Coxswain is the highest normal rank which may be achieved.”

verb

1. (intransitive, transitive)To act as coxswain for.

   “to coxswain for a college rowing team”

   “to coxswain a boat”