throw good money after bad
The phrase "throw good money after bad" means to continue investing or spending money on something that is already unsuccessful or a lost cause. It implies that by continuing to invest in a failing venture, one is wasting additional resources on a situation that is unlikely to improve or yield positive results.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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