put their money where their mouth is

To put your money where your mouth is是一种不很正式的方式告诉别人不要说大话,不如用钱来证明他说的话是确实的,或者是拿出证据,或实是际行动来.在下面这个例子里说话的人有一个朋友.他老是吹牛说他大学里的足球队是如何每次比赛都取胜的.这个人听的都厌烦死了,于是他对这个朋友说：
Jack,you're talking big about how great your team is and how bad they'll beat my team Saturday.Okay,let's bet fifty dollars on who wins.Let's see you put your money where your mouth is!
这人说：杰克,你说了那末多大话,说你们球队有多好,他们星期六会如何把我的球队打得惨败.行,我们拿五十块钱来打赌,看看到底谁赢.让我们来看看你的话到底是不是确实.