美国街头常用英语俚语S-6: Shoot one's mouth off/ Shoot oneself in the foot (mp3和文本下载)

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1. Shoot one's mouth off 信口开河，唠唠叨叨

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。

疯狂联想：把一个人的嘴巴比作一挺上了子弹的机关枪，枪一响就再也停不下来。

2. Shoot oneself in the foot 搬起石头砸自己的脚

He tried to make friends by bad-mouthing others, but he shot himself in the foot -- nobody's around him now.
他想过说人坏话的方式结交朋友，结果是搬起石头砸自己的脚——现在没人愿和他玩。

释义：直译是开枪打中了自己的脚。这习语是说人笨手笨脚，想开枪打别人，却失手打伤了自己的脚。