Colour Idioms in English

English is full of colour — and not just on the surface. Native speakers love using colours to express feelings, reactions, and everyday situations, often without even realising it. You might see red, feel green with envy, or celebrate by painting the town red — all without mentioning actual colours at all.
In today’s lesson, you’ll learn some of the most useful colour idioms in English, explained clearly and illustrated with natural examples. By the end, you’ll recognise them instantly — and, more importantly, feel confident using them yourself.

Once in a blue moon

Meaning: very rarely.
  • I see my cousins who live abroad once in a blue moon.
  • He cooks dinner once in a blue moon, usually when guests come over.

True blue

Meaning: loyal and faithful.
  • You can trust Emma completely — she’s true blue.
  • Despite all the pressure, he remained true blue to his principles.

A yellow streak

Meaning: a tendency to be cowardly.
  • He talks bravely, but there’s a yellow streak in him when things get risky.
  • She backed out at the last minute, revealing a yellow streak.

 

Green around the gills

Meaning: looking sick or unwell.
  • You look green around the gills — maybe you should lie down.
  • He went green around the gills during the boat trip.

To have a green thumb

Meaning: to be good at gardening.
  • My grandmother has a green thumb; her garden is always full of flowers.
  • Even houseplants survive in her flat — she really has a green thumb.

White elephant

Meaning: something expensive but useless or difficult to maintain.
  • The empty stadium turned out to be a white elephant for the city.
  • That luxury car became a white elephant once repair costs piled up.

In black and white

Meaning: written clearly and officially. Colour idioms in English
  • The company policy is stated in black and white in the handbook.
  • If it’s not in black and white, I won’t sign anything

To paint the town red

Meaning: to go out and celebrate wildly.
  • After the exams, the students painted the town red.
  • They decided to paint the town red to celebrate their engagement.

In the red

Meaning: losing money; in debt.
  • The business was in the red for months before it recovered.
  • I can’t afford a holiday — my account is still in the red.

To see red

Meaning: to become extremely angry.
  • He saw red when he realised he’d been lied to.
  • She completely saw red after reading the rude email.

Out of the blue

Meaning: suddenly and unexpectedly.
  • She called me out of the blue after years of silence.
  • Out of the blue, the company announced massive changes.

Black sheep

Meaning: a person who is different or disgraced in a group.
  • He’s considered the black sheep of the family.
  • Every family seems to have a black sheep.

Caught red-handed

Meaning: caught while doing something wrong.
  • He was caught red-handed cheating in the exam.
  • The thief was caught red-handed leaving the shop.

Grey area

Meaning: something unclear or not well defined.
  • The rules are a bit of a grey area here.
  • Tax law often contains grey areas.

Green with envy

Meaning: very jealous.
  • She was green with envy when she saw his new car.
  • His promotion left several colleagues green with envy.

White lie

Meaning: a harmless or polite lie.
  • I told a white lie to avoid hurting her feelings.
  • Sometimes a white lie feels kinder than the truth.

Blue-blooded

Meaning: from a noble or aristocratic family.
  • The castle once belonged to a blue-blooded family.
  • He comes from a blue-blooded background.

Golden opportunity

Meaning: a perfect chance. Colour idioms in English
  • This job offer is a golden opportunity for her career.
  • Don’t miss such a golden opportunity.

Pink slip

Meaning: a notice of dismissal from a job.
  • He received a pink slip during the company downsizing.
  • Many workers feared getting a pink slip before Christmas.

Black and blue

Meaning: covered in bruises.
  • He was black and blue after the rugby match.
  • She fell down the stairs and ended up black and blue.

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