I think she means that she brings the horse back into a disengagement of the hindquarters, which is commonly used to get the horse to start thinking back to the rider.
Yes, Tiny, I guess it isn't a stop perse...more a bending of her neck toward my foot. I do this on either side when she is trying to pull "stuff". This is how I get her to know that she isn't the boss.
I do not do it to be "mean" or harsh. I just draw her head to the side one way and then back the other. Does that make sense?
If wishes were horses, then beggars would ride.