applecart
app·le·cart
noun
1.
the planning that is disrupted when someone `upsets the applecart''
Origin
Back-formation from upset the applecart.
Related words
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.