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Verb: break the bank
  1. (at a casino etc.) to win more money than is available to be paid
    "The lucky gambler broke the bank at the roulette table"
     
  2. [informal] Cost more than can be afforded
    "That luxury vacation would break the bank for our family budget"

Derived forms: broke the bank, broken the bank, breaking the bank, breaks the bank

Encyclopedia: Break the bank