Throw money down the drain

“Throw money down the drain,” is an idiom which means wasting money on something that is unnecessary or doesn’t provide any value. It’s like pouring money into something that won’t benefit you in the end. The idiom is often used to express frustration or disappointment when money is spent on something that turns out to be a complete waste. It’s like flushing money down the drain, just like you would with water. It’s a way of saying that you regret spending your hard-earned money on something that didn’t serve any purpose.
People also use this idiom when talking about investments or business ventures that didn’t turn out as expected. If a company spends a lot of money on a project that fails, they might say they “threw money down the drain.”