Définition et Signification de "[upset|overturn] the apple cart"

What is the origin of the idiom "upset the apple cart" and when to use it?

The idiom "upset the apple cart" originates from the image of a person accidentally or intentionally tipping over a cart filled with apples, creating a mess and disrupting order. It is used to describe an action that causes chaos, disruption, or ruins existing plans, often due to carelessness or a sudden change in circumstances.