"[get] {one's} act together"의 정의 및 의미

What is the origin of the idiom "get one's act together" and when to use it?

The idiom "get one's act together" originated in the United States in the mid-20th century. The exact origin of the expression is unclear, as it evolved through informal and colloquial usage. It is often used when someone is perceived as being disorganized, lacking focus, or under performing and needs to make positive changes.