"beyond the pale"의 정의 및 의미

What is the origin of the idiom "beyond the pale" and when to use it?

The idiom "beyond the pale" has its origins in the historical use of the word "pale" to refer to a fence or boundary. Specifically, it refers to the English Pale in Ireland, which was a defined area under English control. It is used when discussing situations or conduct that is believed to be morally, socially, or culturally unacceptable.