spend money like water
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To spend money excessively or wastefully. For years he was an absolute penny-pincher. Now that he's got a steady job, he spends money like water.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
spend money like water
If someone spends money like water, they regularly spend a lot of money. So she liked a drink, loved her horses and spent money like water. So what?
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012