تعریف و معنای "[do] {sb} (the|a) world of good"

What is the origin of the idiom "do someone the world of good" and when to use it?

The origin of the idiom is uncertain, but it is believed to have developed in the English language in the 1800s. The phrase "do someone good" has been in use since at least the 1500s, and the addition of "the world of" likely emphasizes the magnitude or significance of the benefit being provided. The idiom is often used in the context of offering advice or suggestions for how someone can improve their well-being.