What is the origin of the idiom "the shoe is on the other foot" and when to use it?

The idiom "the shoe is on the other foot" originates from the practice of wearing shoes, and it suggests that a situation has reversed or changed, often implying that the roles or circumstances have been swapped. The phrase is thought to have been in use since the 19th century. It is used to convey the idea that what was once applicable to one party is now applicable to the other, signifying a change in positions or circumstances.