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Phrase(s): Put your money where your mouth is!
Inf. Stop just talking and stake your own money! (From gambling. Can also be said to someone giving investment advice.) • You want me to bet on that horse? Did you? Why don’t you put your money where your mouth is? • If this is such a good stock, you buy it. Put your money where your mouth is!
McGrawhill's American Idioms And Phrasal Verbs