Something fragile that is likely to fail or collapse.
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Something that looks solid but could fall apart at any moment.
A house of cards is built on a shaky base, so one small knock brings it down.
It is used to warn that something rests on too many uncertain things to last.
"Built on Sand"
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Founded on weak or unreliable foundations that will not support long-term stability
"Smoke and Mirrors"
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Something that looks impressive or real but is actually an illusion designed to trick
"A House of Cards"
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Something that appears solid but is dangerously fragile and likely to collapse