Who is the fat lady in idiom its not over until sing?

The phrase "it ain't over 'til the fat lady sings" is a metaphor that originated from the world of opera. In an opera, the main character is often a soprano who sings a dramatic aria near the end of the performance. This aria is often the climax of the opera, and it is the moment when the audience knows that the story is coming to a close.

The phrase "it ain't over 'til the fat lady sings" is used to remind people that anything can happen until the very end. Even if it seems like something is certain to happen, there is always a chance that something will happen to change the outcome. This phrase is often used in sports, politics, and other competitive situations.

There is no one definitive answer to the question of who the fat lady is. Some people believe that the fat lady is the soprano who sings the final aria in an opera. Others believe that the fat lady is simply a metaphor for the unknown. No matter who she is, the fat lady is a reminder that anything can happen, and that it is never over until it is over.