put one's money where one's mouth is

說話算數，說給錢就給錢。

例句：

• If people are really interested in helping the homeless they should put their money where their mouth is. (如果人們真的有意幫助無家可歸的人，那麼他們應該說話算數，說給錢就給錢)
• Congress needs to put its money where its mouth is and really support energy conservation. (國會須兌現撥款承諾，確實支持節約能源)

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