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put (one’s) money where (one’s) mouth is
To do, live up to, or follow through on something one talks about, threatens, or promises, especially (but not always) when it involves spending money. Fans who have been demanding a sequel for the last decade had better put their money where their mouth is and go buy a ticket! He promised to lower taxes if he got elected. Now let’s see if he’ll put his money where his mouth is.
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!