Wiktionary
horsebreaker
n. One who trains, or break in, horses.
Usage examples of "horsebreaker".
Ademar is being guided, as a capricious stallion by a master horsebreaker, towards a destination Galbert has likely wanted to reach for more years than anyone knows.
She has such a passion for it, I often tell her if everything else fails, she can be a horsebreaker, and get her living so.