The metal mouthpiece and control system a horse wears, or the process of fitting and adjusting this equipment for proper control while riding.
From 'bit' (the metal bar placed in a horse's mouth), plus the gerund suffix '-ing,' referring to the action of using bits or the equipment itself.
Horse bitting is a whole science—different bit designs create different pressure points and signals, and a horse's comfort depends on proper fitting, which is why serious equestrians will spend hundreds on the perfect bit.
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