A flimsy framework, arrangement, or scenario that is at risk of collapsing or a deep failing: "The collapse for the rupiah . . . has taken down a property of cards in overleveraged conglomerates” ( Sander Thoenes).
A structure made by laying cards perpendicularly along with each other
A structure or argument built on a shaky basis
a speculative plan that will depend on unstable elements your planner cannot control