Definition of house of cards noun from the Oxford Advanced American Dictionary

     

    house of cards

     noun
    noun
     
    [singular]
     
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  1. 1a plan, an organization, etc. that is so badly arranged that it could easily fail The enormous national debt amassed in the last eight years makes all this apparent prosperity nothing but a house of cards.
  2. 2a structure built out of playing cards
See the Oxford Advanced Learner's Dictionary entry: house of cards