Bridle (noun)

1. A piece of equipment, typically made of leather or nylon straps, that is placed over a horse's head and used to control and direct the animal.
2. A restraint or control on one's emotions or behavior.

Origin:

From the old english word "bridel" which means a headgear for a horse.

Examples:

1. He put the bridle on the horse before they went for a ride.
2. The bridle has a bit in the horse's mouth to help control it.
3. It is important to adjust the bridle properly to ensure the horse is comfortable.
4. He had to use all his willpower to bridle his anger.
5. The government put a bridle on the press to prevent criticism.