"in the can"의 정의 및 의미

What is the origin of the idiom "in the can" and when to use it?

The idiom "in the can" has its origins in the early days of film-making, when movies were recorded on actual film reels. After a scene was successfully filmed, the film reel containing the footage was placed in a can or film canister for storage and later processing. Over time, the phrase has been adapted to indicate that a task or project is finished or that something is completed and ready for use.