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Vocabulary
IDIOMS WITH COLOURS
BLUE
- to go off into the blue = go away suddenly and without trace.
The cashier went off into the blue with ten thousand dollars. - to have blue blood = be aristocratic.
- to look/feel blue = look/feel sad, depressed.
- to scream/yell blue murder = protest wildly and noisily.
The union yelled blue murder when one of its members was sacked. - to do something till one is blue in the face = work as hard and as long as one possibly can (usually without success).
He can write me letters till he's blue in the face, I'm not going to reply. 
once in a blue moon = very rarely or never.
I see her once in a blue moon.- out of the blue = unexpectedly.
Her resignation came right out of the blue. - a bolt from the blue = unexpected and usually unwelcome event, complete surprise.
The news of her resignation was like a bolt from the blue. - a blue-collar worker = manual worker. (The opposite is a white-collar worker)
- a blue film/joke = a pornographic or indecent film/joke.
- the boys in blue = the police.
Exercise
Choose the right answer.
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