What is the origin of the idiom "fair enough" and when to use it?

The origin of the idiom "fair enough" is not precisely documented, but it emerged as a colloquial expression in the 19th century. The phrase combines the words "fair," meaning reasonable or just, and "enough," indicating an adequate or acceptable extent. "Fair enough"Fair enough" is a response that is used to acknowledge the validity or reasonableness of a statement or argument.