University of Denver. Let's talk. The Professional Psychology Clinic (PPC) is the training center for the Graduate School of Professional Psychology at the University of Denver. The PPC has provided low cost, high quality psychological services to Denver's community for over 30 years.
upset - thrown into a state of disarray or confusion; troops fleeing in broken ranks; a confused mass of papers on the desk; the small disordered room; with everything so upset
Upset the apple cart meaning. Upset the apple cart is an idiom which means  changed the established order of things. It is a reference to the way that carts for selling apples are traditionally stacked in a neat and orderly manner. This keeps the round(ish) apples from rolling out of the cart and all over the floor.