Red
Red tape 官僚主义
e.g. with all the red tape I ran into in the district office, it took me three hours to get my ID back.
区公所的官僚作风让我花了三小时才拿回我的身分证。
Red flag 红旗; 警讯
e.g. I don’t trust this company. It may be a red flag that they fired several employees.
我不信任这家公司，他们解雇了那么多的员工可能是个警讯。
Caught red-handed逮个正着
e.g. Rita caught her daughter red-handed eating cookies.
Rita逮到她的女儿偷吃饼干。
Paint the town red 大肆狂欢
e.g. Let’s go paint the town red in Honk Kong!
我们去香港狂欢吧！
Blue
Blue blood 贵族出身
e.g. The gentle speaks, acts, and even walks as a blue blood.
那位绅士言谈、举止甚至行走都像个贵族出身。
Blue jokes 低级笑话
e.g. Telling blue jokes all the time makes Johnson edged out in the class.
Johnson不停地讲黄色笑话的作风让他在班上被排挤。
True-blue 值得信赖的; 坚定的
e.g. We can depend on Wilson for help. He’s a true blue.
我们需要帮助时可以依赖Wilson，他是个可信赖的人。
Holiday blues 假日忧郁症 (类似 back-to-work blues返工忧郁症)
e.g. Students were trying hard to beat the holiday blues after the summer vacation.
学生很努力试着在暑假过后摆脱假日忧郁症。
Green
Green meat 新鲜且刚切好的肉
e.g. I’ll cook! I just got a great piece of green meat!
我来煮吧！我刚弄来一块现切的肉呢！
Green thumb(US)/ Green fingers(UK) 园艺技能
e.g. Fiona’s green thumb is the envy of her friends.
Fiona的朋友都羡慕她的园艺技巧。
Green hand 新手
e.g. I’m still a green hand in handling such things.
对于处理这些事来说，我还是个新手。
Green beans 四季豆
补充：
azuki/ adzuki beans 红豆 mung beans/ green grams 绿豆
black beans 黑豆 soybean 黄豆
Yellow
Yellow journalism 煽情的新闻
e.g. Yellow journalism is hardly educational, but a lot of people love it.
煽情的新闻没什么教育性，但却很多人爱看。
Yellow belly 胆小鬼
e.g. Erica, you yellow belly! Nobody is knocking the door!
Erica你这个胆小鬼! 根本没有人在敲门!
Yellow pages 电话簿
e.g. We can find the number of this company from the yellow pages.
我们可以从这本电话簿里找到这家公司的电话。
Black
Black sheep 败家子/ 害群之马
e.g. (俚语) There is a black sheep in every flock.
到处都有害群之马。
Black tie 小礼服
e.g. Most of the guests will be wearing black tie tonight.
大多数的客人在今晚都会穿着晚礼服。
Black and blue 遍体鳞伤
e.g. The smugglers were beat black and blue.
这些走私犯被打得遍体鳞伤。
Black look 白眼
e.g. She gave me a black look when I mentioned her ex.
我提到她前男友时，她丢给我了个白眼。
White
White lies 善意的谎言
e.g. Sometimes people are forced to tell white lies.
人们有时总是被迫说些善意的谎言。
White elephant 累赘; 华而不实的东西
e.g. That huge clock tower is now a white elephant in my city.
那巨大的钟楼现在在我住的城市里就是个不中用的东西。
补充：White elephant 的由来
在印度、泰国、缅甸等国白象(white elephant)被视为神圣不可侵犯的动物，人们从不会让它们劳作。据说要饲养一头“white elephant”花费惊人。所以从前中亚的国王对看不顺眼的大臣就会赐予白象，而这臣子当然不敢不好好照顾它，只能为了养这头象而落得倾家荡产。因此后来white elephant就被引申为华而不实或是累赘的意思。
White war 不流血的战争; 经济战
e.g. I hope the war against ISIS is a white war.
我希望对抗伊斯兰国的战争是个不流血的战争。
White night 失眠的夜晚
e.g. We both had a white night last night.
我们两个昨晚都失眠了。
