Put your money where your mouth is
Definition 1 of 1
Pro Tip 1/3Action Needed
Phrase implies taking concrete steps to support your words, usually by spending money or resources. 
He talked about environmental protection, but he really put his money where his mouth is when he installed solar panels.
Pro Tip 2/3Beyond Talking
Emphasizes that actions speak louder than words, particularly in supporting causes or opinions. 
Everyone can say they support local businesses, but you put your money where your mouth is when you shop at them.
Pro Tip 3/3Personal Investment
Indicates a personal financial investment in an idea one advocates for, rather than just verbal support. 
She claimed the startup would succeed, then put her money where her mouth is by investing in it.