blue1 S1 W2
having the colour of the sky or the sea on a fine day [↪ navy, navy blue]:
the blue waters of the lake
a dark blue raincoat
2 [not before noun] informal
sad and without hope [= depressed]:
I've been feeling kind of blue.
blue jokes, stories etc are about sex, in a way that might offend some people ➔ blue movie
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.
5 especially British English
someone who is blue with cold looks extremely cold
6 British English
if someone goes blue, their skin becomes blue because they are cold or cannot breathe properly
7 American English informal
to talk very quickly without stopping