ˌhouse of ˈcards noun [singular]
a plan that is so badly arranged that it is likely to fail

[TahlilGaran] Dictionary of Contemporary English ▲

house of cards
an organization or a plan that is very weak and can easily be destroyed.
The organization that looked so solid and dependable turned out to be a house of cards.

[TahlilGaran] English Idioms Dictionary ▲

house of cards
a poorly thought out plan, something that is badly put together and easily knocked over
The large company was like a house of cards and when there were financial problems in one area the whole business was hurt.

[TahlilGaran] English Idioms Dictionary ▲

house of cards
n. phr. Something badly put together and easily knocked down; a poorly founded plan, hope, or action.
John's business fell apart like a house of cards.

[TahlilGaran] English Idioms Dictionary ▲