What is the origin of the idiom "a fair shake" and when to use it?

The exact origin of the idiom "a fair shake" is uncertain, but it dates back several centuries and has roots in American English. It is believed to have originated in the 19th century as an expression used primarily in the United States. The term "shake" in this context refers to a fair and equal distribution or allocation of something. The phrase could have emerged from the idea of giving someone a fair chance by shaking hands as a symbol of agreement or fairness. It can be used in personal interactions, emphasizing the desire for equitable treatment or opportunities in relationships, friendships, or negotiations.