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

1.
把好錢扔進壞錢裡, 白白浪費錢
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.
再往那個失敗的企業投資,就等於是把好錢扔進壞錢裡。
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She realized she was just throwing good money after bad trying to fix the old car.
她意識到她只是在白白浪費錢去修理那輛舊車。