Black
A list of people that are unacceptable and should be avoided
Blacklist
Unexpected
Out of the blue
Get approval to move ahead or proceed with a project or task.
Get or give the green light
Excessive bureaucracy, too much rules and formalities
Red tape
A style of newspaper reporting that emphasised sensationalism over facts.
Yellow press
Creating comedy out of a tragic event or situation
Black comedy
To feel sad or unhappy.
Feel blue
An unusual ability to make plants grow.
Green thumb
Go out and enjoy yourself
Paint the town red
Not brave and easily frightened
Yellow-bellied
A person who is a disgrace or embarrassment to a group such as a bad character in an otherwise respectable group.
Black sheep
An aristocrat
Blue blood
Jealous or envious.
Green with envy
A warning of danger or a signal that something is not working properly or correctly.
Red flag
A path believed to lead to success or adventure.
Yellow brick road