Definition & Meaning of "[put] {sb} in the picture"

What is the origin of the idiom "put someone in the picture" and when to use it?

The idiom "put someone in the picture" likely has its origins in visual or cinematic metaphors. In this context, "the picture" refers to a situation, plan, or scenario. The idiom emerged in the early to mid-20th century when cinema and photography were popular forms of entertainment and communication. It is often used to describe the act of providing someone with all the necessary information or details about a particular situation, plan, or event to ensure they have a comprehensive understanding.