In English, we have many idioms, or expressions, using colors.
For example, if I am feeling blue, how am I a feeling? I’m sad. Blue is associated with sadness.
Or I am the black sheep of my family. That refers to the bad one in the family or group.
Or I told a white lie. That’s “a nice lie”, to spare someone’s feelings.
Others color idioms include:
Black market: Buying goods or services illegally.
Blackmail: To extort money from someone.
Brown bag it: To bring your own lunch to work.
Gray area: Not clearly defined.
In the black: To be profitable
In the red: To be in debt
Out of the blue: Without warning
Red eye: Airplane flight that lasts all night
Do you have these same color expressions in your country?