Colours-'Blue' Idioms

Between the devil and the deep blue sea: between a rock and a hard place, between two fires, between a hammer and an anvil, be in a difficult position.

Be black and blue: showing signs of being physically abused.

Burn with a low blue flame: be very angry.

Come out of the blue: appear suddenly, as if from nowhere.

Get / have the blues: be sad and depressed.

Like a bolt from the blue: suddenly and without warning.

Once in a blue moon: very rarely.

Out of a clear blue sky: suddenly and without warning.

Talk a blue streak: talk very much and very rapidly.

Talk until one is blue in the face: talk until one is exhausted.

Appear from/out of the blue: suddenly and without warning.

Blue joke: improper joke.

Oxford/Cambridge/dark/light/navy blue: variations of blue.

Blue stocking: a woman who is regarded as having superior literary tastes and intellectual interests.

Blue one’s money (sl.): spend recklessly.

True blue: loyal follower