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