shoot one's mouth off是什么意思？如果把一个人的嘴巴比作一挺上了子弹的机关枪，那么枪一响，肯定是不可能停下来了。所以，shoot one's mouth off比喻“信口开河，唠唠叨叨”。

1.He always shoots his mouth off and says things he later regrets.
他总是信口开河，结果尽说些让他自己事后后悔的话。

2.A guy like Brown could shoot his mouth off.
布朗这种人，一谈起来天花乱坠。

3.He likes so shoot off his mouth about what he did in the past.
他喜欢吹嘘他过去做过的事情。

4.We were hoping to keep the party a secret. What made you go and shoot your mouth off about it?
对晚会一事，我们想保守秘密的。你怎么搞的，口无遮拦，随随便便地就把它说出去了？