1. [n]  a deep and vivid red
2. [adj]  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. [adj]  having any of numerous bright or strong colors reminiscent of the color of blood or cherries or tomatoes or rubies
4. [adj]  (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. [v]  turn red, as if in embarrassment or shame; "The girl blushed when a young man whistled as she walked by"

Crimson
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1. \Crim"son\ (kr?m"z'n), n. [OE. crimson, OF. crimoisin,
   F. cramoisi (cf. Sp. carmesi.) LL. carmesinus, fr. Ar.
   qermazi, fr. qermez crimson, kermes, fr. Skr. k?mija produced
   by a worm; k?mi worm or insect + jan to generate; akin to E.
   kin. CF. {Carmine}, {Kermes}.]
   A deep red color tinged with blue; also, red color in
   general.
         Theugh jour be as scarlet, they shall be as white as
         snow; though they be red like crimson, they shall be as
         wool.                                    --Is. i. 18.
         A maid jet rosed over with the virgin crimson of
         modesty.                                 --Shak.
   

2. \Crim"son\, a.
   Of a deep red color tinged with blue; deep red. ``A crimson
   tide.'' --Mrs. Hemans.
         The blushing poppy with a crimson hue.   --Prior.
   

3. \Crim"son\, v. t. [imp. & p. p. {Crimsoned} (-z'nd); p.
   pr. & vb. n. {Crimsoning}.]
   To dye with crimson or deep red; to redden.
         Signed in thy spoil and crimsoned in thy lethe. --Shak.
   

4. \Crim"son\, b. t.
   To become crimson; to blush.
         Ancient towers . . . beginning to crimson with the
         radiant luster of a cloudless July morning. --De
                                                  Quincey.
   

See COLOUR.