Idiom Definition:
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"house of cards"
an organization or plan that is very weak and can easily be destroyed
Synonyms: chiffon, cut-rate, decrepit, defective, delicate, diaphanous, feeble, fragile, frail, gauzy, gossamer, inadequate, infirm, insubstantial, meager, papery, rickety, rinky-dink, shaky, shallow, sheer, slapdash, sleazy, slight, superficial, tacky, transparent, unsound, unsubstantial, weak, wobbly