After visiting an eye-popping Op Art exhibition on the weekend, I felt inspired to research idioms about colours, shapes and patterns.
In fact, I’m surprised I haven’t covered them already as part of my series!
It turns out there are so many that I’m going to split them into two posts – starting with colour idioms.
As per usual, I’ve added in some links for those who like to learn about the etymology of the more unusual phrases.
Idioms about colours in general
To nail one’s colours to the mast = to defiantly display one’s opinions or beliefs
To sail under false colours = to deliberately hide one’s identity or opinion
To show one’s true colours = to make one’s true opinion known; to show one’s real self (after being deliberately misleading)
Idioms featuring the colour blue
Baby blues = Feelings of depression or anxiety, experienced by some mothers following childbirth
Between the devil and the deep blue sea = trapped between two equally difficult sets of circumstances
Blue-blooded = born into a royal or aristocratic family
Blue-eyed boy = favourite of someone in authority
Bluestocking = erudite/literary woman
Bolt from/out of the blue = totally unexpected, like a bolt of lightning from a clear blue sky
Once in a blue moon = very rarely
To do something until one is blue in the face = to persist in trying one’s hardest at an activity but without success
To shout/scream/cry blue murder = to shout aloud in alarm or distress
Idioms about the colour red
Red as a beetroot = red-faced, usually through embarrassment
Red herring = deliberate misleading and diverting of attention from the real issue
Red-letter day = day to celebrate, day of special significance
Red tape = excessive bureaucracy/form-filling
To be caught red-handed = to be caught in the act of committing a misdemeanour, with the evidence for all to see
To be in the red = to be in debt, overdrawn, losing money
To paint the town red = to go out on a spree, indulge in excessive revelry
To see red = to suddenly become very angry, lose control
To wave a red rag to a bull = to deliberately provoke in order to bring about an adverse reaction
Miscellaneous colour idioms
Born in the purple = born into a reigning family or privileged class
Green-eyed monster = jealousy, envy
Grey area = area of law etc. that doesn’t fall into any predefined category
In the pink = in extremely good health and spirits
Purple patch = overly elaborate or effusive piece of writing; period of notable success or good luck
Shrinking violet = shy or modest person
Tickled pink = delighted
To give/get the green light = to allow/be allowed to proceed
Black and white idioms
Black mark (against someone) = showing dislike or disapproval of something that someone has done
Black sheep of the family = disreputable or disgraced member of a family
Black spot = place notorious for something, e.g. accidents or crime
In black and white = in writing or in print (cf. word of mouth)
To be in someone’s black book(s) = to be out of favour with someone, be in disgrace
To be in the black = to be in credit, solvent
White elephant = unwanted object, creating more trouble than it is worth
White lie = harmless or trivial lie, usually to avoid hurting someone’s feelings
Phew, who’d have thought there’d be quite so many colour idioms and phrases? And this isn’t even all of them! You can find more here.
If you enjoyed this collection, do keep an eye out for part 2 when I’ll be turning my attention to shapes and patterns…






Brilliant, as per usual 🙂 It’s always a sheer delight to read your blogs. For eyes, heart, and brain (love Oxford comma). And for ears, I’m certain. Looking forward to and keeping an eye out for part 2. Your English is so sophisticated. Connoisseurs do appreciate. Balsam for English lovers.
May I add “with flying colours” (triumphally)?
Thanks so much Tania for your kind words! It really does help to know that the time spent researching & writing these posts is appreciated!
I can’t believe I missed out “pass with flying colours” (although I did include it in my exams idioms post) 🙂
The pleasure is all mine.Thank you for what you are doing, Geraldine!
Aw, not sure what to say to that!