To back up your words with action, especially by investing your own resources in what you claim to believe in.
This American phrase emerged in the early 1900s, likely from gambling culture where people were challenged to bet on their confident predictions. The phrase gained broader usage during the mid-20th century as a way to challenge someone to prove their sincerity through concrete action rather than just talk.
The phrase brilliantly captures the difference between cheap talk and genuine commitment - money represents real sacrifice and risk, making it the ultimate test of sincerity. It's become especially relevant in modern times with crowdfunding and investment culture, where people literally can put their money behind their beliefs and values.
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