definition of
blue

[1] #1 blue s. [bluish, blueish] of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky; "October's bright blue weather"- Helen Hunt Jackson; "a blue flame"; "blue haze of tobacco smoke". wn

[2] #2 blue n. [blueness] blue color or pigment; resembling the color of the clear sky in the daytime; "he had eyes of bright blue". wn

[3] #3 blue n. blue clothing; "she was wearing blue". wn

[4] #4 blue n. any organization or party whose uniforms or badges are blue; "the Union army was a vast blue". wn

[5] #5 blue s. [gloomy, grim, depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited] filled with melancholy and despondency ; "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his. wn