Definition & Meaning of "[ride] high"

What is the origin of the idiom "ride high" and when to use it?

The phrase "ride high" is believed to have originated in the 19th century. It is thought to be derived from the image of a horse rider who is sitting high in the saddle. This image suggests that the rider is in a position of control and authority. It is used to describe a situation where someone is experiencing a period of great success, happiness, or confidence.