foot是脚，mouth是嘴巴，put your foot in your mouth可不是把你的脚塞进嘴巴，而是说错话使人尴尬；冒犯别人。

【例句】
Sorry, I really put my foot in my mouth at the wedding.
对不起，我真的在婚礼上说错话了。

I really put my foot in it with Ella—I didn't know she'd split up with Tom.
我真的冒犯了埃拉—我不知道她和汤姆分手了。