1. 月亮;月球
    The moon is the object that you can often see in the sky at night. It goes round the Earth once every four weeks, and as it does so its appearance changes from a circle to part of a circle.

moon的反义词

    e.g. ...the first man on the moon...
           登上月球的第一人
    e.g. There will be no moon.
           月亮不会出来了。

2. 卫星
    A moon is an object similar to a small planet that travels around a planet.

    e.g. ...Neptune's large moon.
           海王星的大卫星

3. 虚度光阴;懒散度日;闲逛
    If you are mooning around, you are spending time doing nothing in particular, for example because you feel unhappy or lazy, or are worried about something.

moon

    e.g. Lettie was mooning around all morning, doing nothing...
           莱蒂混了一上午，什么也没干。
    e.g. My working days were spent mooning round his department, trying to sneak a chance encounter.
           上班时我在他的部门转来转去，暗中寻找巧遇他的机会。

4. 对…露出光屁股
    If you moon at someone, you turn your back to them and show them your bare bottom.

5. 千载难逢;百年不遇
    If you say that something happens once in a blue moon, you are emphasizing that it does not happen very often at all.

moon的近义词

    e.g. Once in a blue moon you get some problems.
           极少会碰到麻烦。

6. 非常高兴;乐翻了天;狂喜
    If you say that you are over the moon, you mean that you are very pleased about something.