a pushcart used by a vendor of apples.
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.

1780–90; apple + cart Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
applecart (ˈæpəlˌkɑːt)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Witnesses in executive sessions discuss things that will not upset the applecart if they become public.
We keep hearing that officials don't want to upset the diplomatic applecart.
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