Red tape - Official or bureaucratic tasks 官方或正式的任务

To be yellow - To be cowardly 感到害怕或懦弱

To see red - To be very angry 感到非常生气

Black out - Faint 晕倒

Black and blue - Describe something that is badly bruised 描述严重擦伤的东西

Golden opportunity - The perfect chance 最佳机会

Have the blues - Be sad or depressed 感到悲伤或抑郁

Black sheep - A person who is a disgrace to a family or group 使家庭或团体蒙羞的人

Black and blue - To be bruised either because of a beating or otherwise.因为殴打或其他原因而被撞伤。

Catch someone red-handed - To get caught doing something wrong,illegal or unlawful.做错事被发现做错事，违法或非法。

Green with envy - To feel extremely jealous. 嫉妒得发青，感到非常嫉妒。

Off color - A term used for someone looking weak or unwell. 用来指看起来虚弱或不舒服的人。

Once in a blue moon - To refer to something that occurs very rarely. 指很少发生的事情。

See red - To be extremely angry about something 对某事非常生气

To show your true colors - Reveal the kind of person they really are. 揭示他们真正是什么样的人。