throw good money after bad
US /θroʊ ɡʊd ˈmʌn.i ˈæf.tər bæd/
UK /θroʊ ɡʊd ˈmʌn.i ˈæf.tər bæd/

1.
밑 빠진 독에 물 붓기, 헛돈 쓰다
to waste money by spending more on something that has already been unsuccessful
:
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Investing more in that failing business would be like throwing good money after bad.
실패한 사업에 더 투자하는 것은 밑 빠진 독에 물 붓기와 같을 것이다.
•
She realized she was just throwing good money after bad trying to fix the old car.
그녀는 낡은 차를 고치려고 하는 것이 단지 밑 빠진 독에 물 붓기라는 것을 깨달았다.