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house of cards
01
an unstable construction with playing cards
1.1
a situation, plan, system, etc. that is not stable enough to continue succeeding and can easily fail or get out of control
Example
Their financial success was like a house of cards, relying on unsustainable investments and shaky business practices.
The peace agreement in the region was fragile, like a house of cards, and the slightest political unrest could lead to its collapse.
