The noun red has 4 senses (first 3 from tagged texts)
1. (9) red, redness -- (red color or pigment; the chromatic color resembling the hue of blood)
2. (7) Red, Red River -- (a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana)
3. (1) Bolshevik, Marxist, red, bolshie, bolshy -- (emotionally charged terms used to refer to extreme radicals or revolutionaries)
4. loss, red ink, red -- (the amount by which the cost of a business exceeds its revenue; "the company operated at a loss last year"; "the company operated in the red last year")
Overview of adj red
The adj red has 4 senses (first 4 from tagged texts)
1. (43) red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby, ruby-red, scarlet -- (of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies)
2. (8) crimson, red, violent -- (characterized by violence or bloodshed; "writes of crimson deeds and barbaric days"- Andrea Parke; "fann'd by Conquest's crimson wing"- Thomas Gray; "convulsed with red rage"- Hudson Strode)
3. (7) crimson, red, reddened, red-faced, flushed -- ((especially of the face) reddened or suffused with or as if with blood from emotion or exertion; "crimson with fury"; "turned red from exertion"; "with puffy reddened eyes"; "red-faced and violent"; "flushed (or crimson) with embarrassment")
4. (3) red -- (red with or characterized by blood; "waving our red weapons o'er our heads"- Shakespeare; "The Red Badge of Courage"; "the red rules of tooth and claw"- P.B.Sears)