What is the origin of the idiom "airs and graces" and when to use it?

The origin of the idiom "airs and graces" can be traced back to 18th-century England when it was commonly used in polite society. "Airs" referred to affected manners or behavior, while "graces" referred to the outward display of elegance or refinement. The phrase originally stemmed from the idea of someone putting on a performance or show to project an image of higher social standing or sophistication. It is often used to criticize individuals who act in a contrived or exaggerated manner to appear more important or refined than they truly were.