blue adjective - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “blue”

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blue

adjective
 
 
/bluː/
COLOUR A1 being the same colour as the sky when there are no clouds: a dark blue jacket Common coloursLess common colours
SAD informal sadFeeling sad and unhappy
SEX about sex: a blue joke/movie →  See also black and blue , once in a blue moon Relating to sex and sexual desireRude and cheeky
(Definition of blue adjective from the Cambridge Learners Dictionary © Cambridge University Press)
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