What is the origin of the idiom "the world and his wife" and when to use it?

The idiom "the world and his wife" is an old English idiom that dates back to at least the 18th century. It reflects a traditional view of society where the husband was considered the head of the household, and "the world" represented everyone, including the husband and his wife. It implies that a large or diverse group of people, often to the point of excess, is involved in a particular situation.People use this phrase to describe a situation where a large number of individuals, often without distinction, are involved or attending an event. It emphasizes the idea that a gathering or event is very crowded or that many people are interested or participating.