upset the apple cart

applecart

[ap-uhl-kahrt]
noun
1.
a pushcart used by a vendor of apples.
Idioms
2.
upset the/someone's applecart, to ruin plans or arrangements; spoil something: He was making a fantastic profit until a competitor upset the applecart by cutting prices.

Origin:
1780–90; apple + cart

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
applecart (ˈæpəlˌkɑːt)
 
n
1.  a cart or barrow from which apples and other fruit are sold in the street
2.  upset the applecart to spoil plans or arrangements

Collins English Dictionary - Complete & Unabridged 10th Edition
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