house of cards
US /ˌhaʊs əv ˈkɑːrdz/
UK /ˌhaʊs əv ˈkɑːrdz/
1.
a plan or organization that is very weak and can easily be destroyed
:
•
Their entire business model was a house of cards, collapsing at the first sign of trouble.
•
The government's new policy proved to be a house of cards, quickly falling apart under public scrutiny.