He's always putting his foot in his mouth.
他说话总是笨拙而不得体。

Scene
Jeff: It seems that Leslie is not popular with the workmates.
Billy: Well, because he's always putting his foot in his mouth.

Notes
是不是感觉这个短语 put one's foot in one's mouth 有点恶心哦？这就很形象嘛！总是说错话，说话笨拙或不得体的人有时确实会令人感到恶心啊~~~

Exercises
下面来看看这两个有foot的短语是啥意思？
1. Now that you're growing up you must learn to stand on your own two feet.
2. The children are under my feet all day.