What is the origin of the idiom "keep one's wits about someone" and when to use it?

The idiom "keep one's wits about someone" has a long history in the English language, dating back to Old English. It evolved from the term "wits," which referred to one's intelligence, mental faculties, and awareness. The exact historical origin is difficult to pinpoint due to its early usage in the language. Over time, it has become a common idiom used to encourage someone to stay alert and use their judgment effectively, particularly in situations requiring quick thinking and decision-making.