over是在上面的意思，moon是月亮的意思。over the moon连在一起，不是登月，而是“高兴万分”的意思。不管遇到什么好事，比如说是涨工资、生宝宝、或是自己支持的球队赢了比赛的冠军，都可以说over the moon来表达兴奋的心情。
这名男子多年来一直暗恋一名女友，让我们看看什么能让他over the moon:
You can imagine how nervous I was when I finally told her how I felt. I didn't know what to expect. She could have gotten angry or acted like I was joking or even felt sorry for me. But, when she said she felt the same way, I was just over the moon.
你可以想象，我向她表白的时候心里有多紧张。我不知道她会有什么样的反应。她可能会生气、也可能会觉得我是在开玩笑，甚至可能会同情我。可是她竟然说，她也喜欢我，这简直让我喜出望外。
这个片段不由得让我们想起爱情影片的最后一幕。在生活中，最大的快乐往往会在最意想不到的时刻出现。
over the moon这个习惯用语来源于一个古老的童谣。
Hey diddle diddle, the cat and the fiddle/The cow jumped over the moon./The little dog laughed to see such fun/ And the dish ran away with the spoon.
这个童谣本身并没有什么具体意思，但是童谣里的over the moon却被作为习惯用语，一直沿用至今。在下面这个例子中，一名老人回忆他第一次被提升的时候说：
It was two weeks after I married your mother. We were living in a tiny apartment and we had no idea how we were going to afford a family. So when I heard I was being promoted to sales manager, I was just over the moon.
当时我娶你妈妈刚刚两个星期，我们住在一个小小的公寓里，不知道怎么能养得起孩子。因此，当我听说自己被提升为销售经理时，简直高兴极了。
这让我想起自己当年申请来美国留学，又考托福，又考GRE，还要申请奖学金，最后得到入学通知和奖学金时，恐怕也只有over the moon才能形容了。最让人高兴的事情，往往是付出努力最多，最终有所收获的事情。
