throw good money after bad

Idioms  

1. Waste more money in hopes of recouping previous losses, as in Hiring him to improve that software is throwing good money after bad; it's based on an older operating system and will soon be obsolete. [Late 1800s]

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Example Sentences

Yet Newcastle's desperation could see them throw good money after bad.

From BBC

Six decades later, the Energy Department has decided to throw good money after bad.

From Scientific American

“Don’t throw good money after bad to prop up a police organization that has shown time and again that it’s unable to keep us safe,” Seattle resident Matt Offenbacher said, joining other community members in calling for the council to instead invest in police alternatives.

From Seattle Times

Wish your friend well in her business, but don’t throw good money after bad.

From Slate

Here’s hoping that the next round does not throw good money after bad.

From Washington Post