Apple-cart

Then some rude soldiers, also from another nation, pushed through the crowd to take a look for themselves, and with great violence tney ran against the apple-cart of the old woman standing there.

Source: wiktionary

But unless one has lost one's senses one does not upset the apple-cart unless one can count on collecting some at least of the apples which roll to the ground.

Source: wiktionary

The doctor is being kept away from a great many homes right now, and a lot of people whose first purchase was a friendly gesture in behalf of the unemployed will doubtless stay on the apple-cart permanently, having discovered that it is a good place on which to ride.

Source: wiktionary

Some have remained silent for fear of upsetting the dogmatic apple-cart or, perhaps, in some misguided attempt to preserve “the unity of the Spirit” (eph 4:3).

Source: wiktionary