rein

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rein

narrow strip of thin leather or other fabric attached to both ends of a bit in a horse's bridle making a loop which passes through the hands of the driver/rider. Used to direct the horse's head and so change its direction.

bearing rein
a fixed rein attached to the saddle or backpad and to the bridle to prevent the horse from lowering its head too far.
check rein
runs from the bit or the crown of the bridle to the saddle in vehicle harness. Limits the range of movements that the horse can make. Is a fixed but adjustable check and is not under the control of the rider/driver.
neck rein
not a piece of harness; is the technique in which the rider moves his/her hands to one side of the horse's neck thus touching the horse with the rein on one side of the neck. The well-schooled horse will move in the other direction.
running rein
runs from the rider, through the rings of the bit and back to the girth. For horses in harness is a very powerful restrainer.
side rein
extends on either side from the bit, through rings on a saddle or pad and ends with the driver walking beside the horse. Used in training a horse to cart harness.