1. 硬币
    A coin is a small piece of metal which is used as money.

coin

    e.g. ...50 pence coins.
           50便士的硬币
    e.g. ...Frederick's gold coin collection.
           弗雷德里克收藏的金币

2. 新造，杜撰(单词、短语)
    If you coin a word or a phrase, you are the first person to say it.

    e.g. Jaron Lanier coined the term 'virtual reality' and pioneered its early development...
           杰伦·拉尼尔创造了“虚拟现实”这个词，并成为推动其早期发展的先驱人物。
    e.g. The word 'lunatic' was coined to describe people who went mad at the full moon.
           lunatic是个生造词，用来形容月圆时发疯的人。

3. 暴富;很快地赚(钱)
    If you say that someone is coining it or is coining money, you are emphasizing that they are making a lot of money very quickly, often without really earning it.

    e.g. Many private colleges are coining it...
           很多私立大学正在大发其财。
    e.g. One wine shop is coining money selling Wembley-label champagne.
           一家葡萄酒商店正在靠出售威丽牌子的香槟大把大把赚钱。

4. 用个双关语;套用句老话
    You say 'to coin a phrase' to show that you realize you are making a pun or using a cliché

    e.g. Fifty local musicians have, to coin a phrase, banded together to form the Jazz Umbrella.
           50名当地的音乐家，用个双关词，“联合起来”（band亦有“乐队”之意）组成了“爵士乐大联盟”。

5. 情况的另一面
    You use the other side of the coin to mention a different aspect of a situation.

    e.g. These findings are a reminder that low pay is the other side of the coin of falling unemployment.
           这些研究结果提醒人们，失业率下降的另一面是低薪。

6. 一个问题的两方面
    If you say that two things are two sides of the same coin, you mean that they are different ways of looking at or dealing with the same situation.

    e.g. The minister reportedly stressed that economic and political reforms were two sides of the same coin.
           据报道，部长强调经济改革和政治改革是一个问题的两个方面。