What is the origin of the idiom "elbow room" and when to use it?

The idiom "elbow room" originated from the literal need for physical space or freedom to move one's elbows comfortably without restriction. It emphasizes the desire for adequate space or personal freedom in a given situation. The phrase conveys the idea of having enough room to maneuver, act, or think without interference or constraint, allowing for a sense of comfort, independence, and flexibility.