Upset the apple-cart
What's the meaning of the phrase 'Don't upset the apple-cart'?
To cause upset - to create a difficulty.
What's the origin of the phrase 'Don't upset the apple-cart'?
This allusory phrase is first recorded by Jeremy Belknap in The History of New Hampshire, 1788:
"Adams had almost overset the apple-cart by intruding an amendment of his own fabrication on the morning of the day of ratification" [of the Constitution].