Usage, symbolism, colloquial expressions
- The colloquial expression "blue" is used to describe melancholy or sadness in English speaking countries. See also Blues music.
- The word "blue" is often used in reference to the Police force; eg. "Boys in Blue", "The blue line"
- The phrase "of blue blood" is used to mean "from an aristocratic background". This expression derives from the bluish appearance of people suffering from hemophilia, which was a comparatively common condition in European nobility in the 16-19th centuries.
- A "Blue movie" is a slang term for a pornographic? film. The term derives from the poor colour balancing (due to cheap production techniques) used in films during the 1970s, resulting in a bluish tone to the skin of the performers.
- In Australia, a "blue" can also describe a fight or an argument.
- "Blue laws" is a slang term for laws regulating issues of morality, such as alcohol, gambling, or sexually-explicit materials.