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English word blue movie comes from English blue
blue (English)
(ergative) To make or become blue.. (transitive, laundry) To brighten by treating with blue (laundry aid). (transitive, metallurgy) To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.. (transitive, slang) To spend (money) extravagantly; to blow. (Australia, colloquial) An argument.. (British) A type of firecracker.. (archaic) A pedantic [...]
blue movie (English)
(idiomatic) a pornographic film.