applecart \ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷\noun Etymology:apple + cart : a plan, scheme, system, undertaking, or situation that is or may be overturned or disrupted often unexpectedly — used especially with upset < upset the whole Darwinian applecart — Julian Huxley > < we might make a wrong move and upset somebody's applecart — Survey Graphic >