BLUE ... the sky, the sea, coldness
Symbolizes - hope, piety, sincerity, fidelity, faith, eternity, immortality, modesty, chastity.

Blue blood - of high or noble birth

a bluebottle - a policeman

blue pencil - the mark of editing or censorship

to feel blue, to have the blues - to feel sad, depressed

blue-stocking - a woman who is more interested in learning and an academic career than in marriage and bringing up children.

Blue films, blue pictures - sexually explicit, indecent, pornographic films or pictures.

out of the blue - to arrive unexpectedly

a bolt from the blue - unexpected bad news

to make the air turn blue - to swear violently

to blue one's money - to spend money wildly

once in a blue moon -  rarely, once in a life-time

to be in a blue funk - to be in a state of cowardly fear

to shout/scream blue murder - to protest most violently at an injustice

In ancient Rome, public servants wore blue. Today, police and other public servants wear blue.

In China, blue is for little girls.

In Iran, blue is the colour of mourning.

Blue was used as protection against witches, who supposedly dislike the colour.

If you are “true blue,” you are loyal and faithful.

Blue stands for love, which is why a bride carries or wears something blue on her wedding day.

A room painted blue is said to be relaxing.

The first prize gets a blue ribbon.
 
 

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