break the bank
Ruin one financially, exhaust one's resources, as in I guess the price of a movie won't break the bank. This term originated in gambling, where it means that a player has won more than the banker (the house) can pay. It also may be used ironically, as above. [c. 1600]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.