spend money like water
US /spɛnd ˈmʌni laɪk ˈwɔtər/
UK /spɛnd ˈmʌni laɪk ˈwɔtər/

1.
揮金如土, 大肆揮霍
to spend a lot of money carelessly or extravagantly
:
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After winning the lottery, he started to spend money like water.
中彩票後,他開始揮金如土。
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If you spend money like water, you'll soon run out of savings.
如果你揮金如土,很快就會花光積蓄。