To spend a lot of money or be very expensive, often beyond one's budget.
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To cost an extremely large amount of money — more than one can comfortably afford.
When something breaks the bank, it is so expensive that it stretches or exceeds your financial limits.
It is also commonly used in the negative — something that does not break the bank is reasonably priced.
"Cost an Arm and a Leg"
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Being extremely expensive, with emphasis on the painful personal sacrifice of the cost
"Blow Your Budget"
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Spending more than the planned budget allows, without necessarily going into major hardship
"Break the Bank"
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Costing an extremely large amount — more than can be comfortably afforded