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

1.
돈을 물 쓰듯이 쓰다, 낭비하다
to spend a lot of money carelessly or extravagantly
:
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After winning the lottery, he started to spend money like water.
복권에 당첨된 후, 그는 돈을 물 쓰듯이 쓰기 시작했다.
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If you spend money like water, you'll soon run out of savings.
돈을 물 쓰듯이 쓰면 곧 저축이 바닥날 거야.