to support your words with actions or financial commitment
用行动或金钱支持你的话 (yong xingdong huo jin qian zhi chi ni de hua)
"If you believe in the project, put your money where your mouth is."
"如果你相信这个项目，就投入资金" (ru guo ni xiang xin zhe ge xiang mu jiu tou ru zi jin)
