| expression |  | meaning | 
					
						| blue (adjective) |  | depressed | 
					
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						| blue-blood (noun) |  | someone from a noble or aristocratic family
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						| blue book |  | (1) an official report; (2) a small paper bookletused for examinations
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						| blue-chip stock |  | stock with high value based on stability and
 past sales
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						| blue-collar worker |  | factory worker | 
					
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						| blue law |  | law which forbids doing certain activities on Sunday
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						| blue nose |  | a person with puritanical religious or moral views
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						| blue-pencil (verb) |  | edit or censor using a pencil which makes
 blue-colored writing
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						| blue print |  | a kind of photographic printing, usually of plans
 for a building; it has
 white lines printed on
 blue paper
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						| blue-ribbon (adjective)
 |  | highest quality (because blue ribbons are awarded
 to winners of first-place prizes)
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						| do something until you're
 blue in the face
 |  | do something until you no longer have energy to do it
 (and with no positive results)
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						| men in blue |  | policemen | 
					
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						| once in a blue moon
 |  | very seldom; very rarely | 
					
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						| out of the blue |  | describes something that happens suddenly and
 also unexpectedly
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						| true blue |  | very loyal |