verb (used with object)
to guide or direct (a horse) with the pressure of a rein on the opposite side of the neck from the direction in which the rider wishes to travel.
verb (used without object)
(of a horse) to respond to such pressure from a rein by going in the desired direction.
Origin of neck-rein
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019