blue - Definition from Longman English Dictionary Online

blue
1 adjective

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blue1 S1 W2 See pronunciation table in "How to use dictionary" pages

1CC having the colour of the sky or the sea on a fine day [↪ navy, navy blue]:

the blue waters of the lake

dark/light/pale/bright blue

a dark blue raincoat

2 [not before noun] informal sad and without hope [= depressed]:

I've been feeling kind of blue.

3 informal blue jokes, stories etc are about sex, in a way that might offend some people ➔ blue movie

argue/talk etc till you're blue in the face

informal to argue, talk etc about something a lot, but without achieving what you want:

You can tell them till you're blue in the face, but they'll still do what they want.

especially British English someone who is blue with cold looks extremely cold

British English if someone goes blue, their skin becomes blue because they are cold or cannot breathe properly

American English informal to talk very quickly without stopping

—blueness noun [uncountable]

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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blue¹ adjective