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English definition of “blue”

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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).
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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.

blue adjective (SAD)

C2 [after verb] informal feeling or showing sadness: He's been a bit blue since she left him.
See also

blue adjective (MEAT)

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

blue

noun uk   /bluː/ us  

blue noun (COLOUR)

A2 [C or U] a blue colour
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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 this
(Definition of blue from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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