Dictionary
ap•ple•cart
Pronunciation: (ap'ul-kärt"), [key]—
n.
1. a pushcart used by a vendor of apples.
2. upset the or 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.