The idiom "put your money where your mouth is" means to back up your words with actions or to prove that you are serious about something by investing your own money in it.
For example, if someone says they can run a marathon in under three hours, but they have never actually run a race before, you might say to them, "If you're so confident, why don't you put your money where your mouth is and bet on yourself to win the race?"
This idiom is often used in situations where someone is making bold claims or promises, but they haven't yet shown that they are willing to take any risks or make any sacrifices to achieve their goals. By challenging them to "put their money where their mouth is," you are essentially asking them to prove that they are willing to back up their words with actions.
• I always say I'm going to start exercising, but I never do. My friend told me to put my money where my mouth is and sign up for a gym membership.
• The government has been promising to invest in renewable energy for years, but they haven't done much. It's time for them to put their money where their mouth is and fund sustainable energy projects.
• My sister-in-law is always talking about how she's going to start her own business. I told her to put her money where her mouth is and invest in a small startup.
• The CEO of the company keeps saying they prioritize employee well-being, but they haven't made any concrete changes. Shareholders are starting to demand that the company put their money where their mouth is and invest in employee benefits and mental health programs.
• My neighbor always talks about how he wants to help the homeless in our community. I challenged him to put his money where his mouth is and donate to a local shelter.
• My coworker keeps complaining about our boss, but she never speaks up in meetings. I told her to put her money where her mouth is and share her ideas with the team.