The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face.

VOA: special.2009.12.13

I think it's very defining and your expression of not wanting something.

它可以非常清晰地表达你厌恶某事的情绪。

I hate 课堂 - SpeakingMax英语口语达人

The sovereign is not the direct expression of my will or your will, but rather an abstraction from my natural desire to rule myself.

君主制不是对我的，或者你的意志的直接表达,不如说是一种抽象概念,是源于自己统治自己的自然愿望。

耶鲁公开课 - 政治哲学导论课程节选

The expression meant that the person who cannot hold a candle to you is not fit even to be your servant.

VOA: special.2011.05.29

If you're stuck, if you're struggling, if you're not certain about something, please ask. We're not mind readers, we can't tell when you're struggling, other than sort of seeing the expression on your face, we need your help in identifying that.

如果你很差，如果你很纠结，如果你不确定某件事情，请问我们，我们不会读心术，我们没法儿看出来你们很纠结，除非能从你们的面部表情看出来，我们需要你们在这件事儿上的配合。

麻省理工公开课 - 计算机科学及编程导论课程节选

To keep your head above water is a colorful expression that means staying out of debt.

VOA: special.2009.05.10

There's this whole sense that the thing is precarious and you'd better kind of mind your Ps and Qs, or whatever the expression is, and be a good person or this whole thing could kind of be literally flooded away.

从这个场景中可以看出堤坝相当不稳定,你最好想想干过什么缺德事儿,或者捅过什么篓子之类的,总之得做个好人,否则,这整个城市就可能真会被大水冲走

耶鲁公开课 - 欧洲文明课程节选

One of these is the expression, carry a chip on your shoulder.

VOA: special.2010.01.17

This much, by the way, Wimsatt has in common with Gadamer, because Gadamer doesn't talk much about authors either, and Gadamer is interested in what he calls meaning, the subject matter, die Sache. Right? He's not interested in your sort of expression of that meaning or my expression of that meaning.

顺便说一句，文萨特和葛达玛很大相同之处就在于，葛达玛也不太强调作者的作用，而是对文章的含义，主题感兴趣，不是吗？，他不关注作品在用,你的还是我的表达方式来表现内涵。

耶鲁公开课 - 文学理论导论课程节选

One such expression is to lose your heart to someone.

VOA: special.2010.07.18

So don't underestimate the value for the next week or two of just inserting printf statements into your code temporarily just to print out what the value of some variable is, or some expression is, so that you can just do a sanity check.

所以不要低估下一两周的重要性,虽然我们只将“printf“语句暂时地植入到,我们的代码中，只是用来打印一些,变量或表达式的值，所以你们提醒一下自己。

哈佛公开课 - 计算机科学课程节选

It can be an expression of regret for your personal actions.

这可以用来表示你后悔自己所做的事情。

I'm sorry 课堂 - SpeakingMax英语口语达人