(COLOUR)

Black and white
When it is very clear who or what is right and wrong, then the situation is black and white.
Black as Newgate’s knocker
If things are as black as Newgate’s knocker, they are very bad. Newgate was an infamous prison in England, so its door knocker meant trouble.
Black hole
If there is a black hole in financial accounts, money has disappeared.
Black sheep
Someone who is the black sheep doesn’t fit into a group or family because their behaviour or character is not good enough.
Feeling blue
If you feel blue, you are feeling unwell, mainly associated with depression or unhappiness.
Great white hope
Someone who is expected to be a great success is a great white hope.
Green fingers
Someone with green fingers has a talent for gardening.
Green light
If you are given the green light, you are given approval to do something.
Green thumb
Someone with a talent for gardening has a green thumb.
Green-eyed monster
The green-eyed monster is an allegorical phrase for somebody’s strong jealousy.
Greenhorn
A greenhorn or someone who is described simply as green lacks the relevant experience and knowledge for their job or task
Grey area
A grey area is one where there is no clear right or wrong.
Grey matter
Greymatter is the human brain.
Grey pound
In the UK, the grey pound is an idiom for the economic power of elderly people.
In the black
If your bank account is in credit, it is in the black.
In the pink
If you are in very good health, you are in the pink.
In the red
If your bank account is overdrawn, it is in the red.
Jet-black
To emphasise just how black something is, such as someone’s hair, we can call it jet-black.
Off colour
If someone looks off colour they look ill.
Out of the blue
If something happens out of the blue, it happens suddenly and unexpectedly.
Paint the town red
If you go out for a night out with lots of fun and drinking, you paint the town red.
Red letter day
A red letter day is a one of good luck, when something special happens to you.
Red light district
The red light district is the area of a town or city where there is prostitution, sex shops, etc.
Red rag to a bull
If something is a red rag to a bull, it is something that will inevitably make somebody angry.
Red tape
This is a negative term for the official paperwork and bureaucracy that we have to deal with.
Sail under false colours
Someone who sails under false colours is hypocritical or pretends to be something they aren’t in order to deceive people.
Scream blue murder
If somone shouts very loudly in anger, or fear, they scream blue murder.
Till you’re blue in the face
If you do something till you’re blue in the face, you do it repeatedly without achieving the desired result until you’re incredibly frustrated.
Under false colours
If someone does something under false colours, they pretend to be something they are not in order to deceive people so that they can succeed.
White as a sheet
A bad shock can make somebody go as white as a sheet.
With flying colours
If you pass something with flying colours, you pass easily, with a very high mark or grade.
Yellow press
The yellow press is a term for the popular and sensationalist newspapers.
Yellow streak
If someone has a yellow streak, they are cowardly about something.
Yellow-bellied
A yellow-bellied person is a coward.