To ride and tie

to take turn with another in labor and rest; - from the expedient adopted by two persons with one horse, one of whom rides the animal a certain distance, and then ties him for the use of the other, who is coming up on foot.
See under Ride.

See also: Ride, Tie

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.