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English definition of “blue”

blue

adjective uk   /bluː/ us  

blue adjective (COLOUR)

A1 of the colour of the sky without clouds on a bright day, or a darker or lighter type of this: a faded blue shirt pale blue eyes Her hands were blue with cold (= slightly blue because of the cold).Common coloursLess common colours

blue adjective (SEXUAL)

showing or mentioning sexual activity in a way that offends many people: a blue joke a blue movie/film His humour is a bit too blue for my tastes.Relating to sex and sexual desireRude and cheeky

blue adjective (SAD)

C2 [after verb] informal feeling or showing sadness: He's been a bit blue since he failed his exams.
See also
Feeling sad and unhappy

blue adjective (MEAT)

(also extra-rare) (of meat) cooked so that it is still very red
blueness
noun [U] uk   /ˈbluː.nəs/ us  
Common coloursLess common colours

blue

noun uk   /bluː/ us  

blue noun (COLOUR)

A2 [C or U] a blue colourCommon coloursLess common colours

blue noun (SPORTS)

[C] UK a person who has played a sport for Oxford University against Cambridge University or for Cambridge University against Oxford University, or the title given to him or her for thisCompetitors and participants in sports and games
(Definition of blue from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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