spend money like water
US /spɛnd ˈmʌni laɪk ˈwɔtər/
UK /spɛnd ˈmʌni laɪk ˈwɔtər/
1.
to spend a lot of money carelessly or extravagantly
:
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After winning the lottery, he started to spend money like water.
•
If you spend money like water, you'll soon run out of savings.