"put somebody out to pasture"の定義と意味

What is the origin of the idiom "put someone out to pasture" and when to use it?

The idiom "put someone out to pasture" is believed to have originated in the United States in the early 20th century and It is thought to refer to the practice of retiring old or worn-out farm animals and allowing them to graze in a pasture. This phrase is used to describe a situation where someone is forced to retire or is no longer useful or productive in their job.