putting one's money where one's mouth is

Verb

put one's money where one's mouth is (third-person singular simple present puts one's money where one's mouth is, present participle putting one's money where one's mouth is, simple past and past participle put one's money where one's mouth was)

1. To make or take a bet.
2. (idiomatic) To take an obvious stake in the truth of a claim that one is making.
   • "The scientists are right to be extremely cautious about interpreting these findings," said Jim Al-Khalili, a physicist from the University of Surrey, who suggested that a simple error in the measurement is probably the source of all the fuss..."So let me put my money where my mouth is: if the Cern...2011 September 23, Jason Palmer, “Light speed: Flying into fantasy”, in BBC News