1. (noun)crimson, ruby, deep red a deep and vivid red color
2. (adj)red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby, ruby-red, scarlet of a color at the end of the colorspectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies
3. (adj)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
4. (adj)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"
5. (verb)blush, crimson, flush, redden turn red, as if in embarrassment or shame "The girl blushed when a young man whistled as she walked by"