Black
Coffee without milk
Black coffee
Unexpected
Out of the blue
Get approval to move ahead or proceed with a project or task.
Get or give the green light
Giving privileged treatment to an important person.
Red carpet treatment
White as a sheet/white as a ghost
Black comedy
To be loyal or faithful
True blue
An unusual ability to make plants grow.
Green thumb
Clearly guilty; caught in the act.
Caught red-handed
Relating to the work done or those who work in an office or other professional environment.
White collar
Somewhere that is very dark, and you are unable to see anything.
Pitch black
An aristocrat
Blue blood
A room (in a theater or studio) where performers can relax before or after appearances.
Green room
Seeing red
The signal of a peaceful surrender.
White flag/ raise a white flag
Blackmail
A detailed design of an object or idea
Blueprint
When someone or something makes changes to help protect the environment, or reduces waste or pollution.
Going green
A warning of danger or a signal that something is not working properly or correctly.
Red flag
A harmless untruth usually told out of politeness.
White lie
A person who is a disgrace or embarrassment to a group such as a bad character in an otherwise respectable group.
Black sheep
To feel sad or unhappy.
Feeling blue
Jealous or envious.
A flight that leaves late at night and arrives early in the morning.
Red-eye
A constant background noise especially noise that drowns out other sounds.
White noise