to upset the apple cart
01
to cause problems, often by ruining or interrupting something that was planned
![to [upset|overturn] the apple cart definition and meaning](https://cdn.langeek.co/photo/46479/original/?type=jpeg "to [upset|overturn] the apple cart definition and meaning")
Idiom
Informal
أمثلة
By revealing the company's financial troubles to the public, the whistleblower really upset the apple cart.
