What is the part of the bit that curves up over the tongue called?

The part of the bit that curves up over the tongue is called the port. The port is an elevated section that can vary in height and shape, influencing how the bit applies pressure to a horse’s tongue and palate. This design element allows for a more comfortable fit for the horse while also providing additional control for the rider.

The port's shape can also affect the severity of the bit. A higher port can relieve pressure on the tongue while increasing the leverage on the horse's jaw. Consequently, in training and riding situations, understanding the characteristics of the port is crucial for selecting the appropriate bit based on the horse's conformation and training needs.

In contrast, other terms such as cheek, D-ring, and buckle refer to different components of the bridle or bit assembly. The cheek is the part that attaches the bit to the bridle and helps keep it in place. The D-ring refers to the shape of the ring that holds the bit in the mouth, providing a specific type of leverage and action. The buckle, on the other hand, is used in the girth or throat latch, but it does not have a direct role in the function of the bit itself.