- blue1 W2S1 [blu:] adj[Date: 1200-1300; : Old French; Origin: blou]1.) having the colour of the sky or the sea on a fine day▪ the blue waters of the lakedark/light/pale/bright blue▪ a dark blue raincoat2.) [not before noun] informalsad 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 people4.) argue/talk etc till you're blue in the face informalto 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.) blue with coldespecially BrE someone who is blue with cold looks extremely cold6.) go blueBrE if someone goes blue, their skin becomes blue because they are cold or cannot breathe properly7.) talk a blue streakAmE informal to talk very quickly without stopping>blueness n [U]blue 2blue2 n1.) [U and C]the colour of the sky or the sea on a fine day▪ She nearly always dresses in blue.▪ the rich greens and blues of the tapestry2.) blues[U] also the bluesa slow sad style of music that came from the southern US▪ a blues singer3.) the blues [plural] informalfeelings of sadness▪ A lot of women get the blues after the baby is born.4.) out of the blue informalif something happens out of the blue, it is very unexpected→a bolt from/out of the blue at ↑bolt1 (3)5.) BlueBrE someone who has represented Oxford or Cambridge University at a sport, or the title given to such a person6.) the blueliterary the sea or the sky→boys in blue at ↑boy1 (9)
Dictionary of contemporary English. 2013.