The Collaborative International Dictionary of English v.0.48:

Crimson \Crim"son\ (kr[i^]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[.r]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.
   [1913 Webster]

         Though your sins be as scarlet, they shall be as white
         as snow; though they be red like crimson, they shall be
         as wool.                                 --Is. i. 18.
   [1913 Webster]

         A maid yet rosed over with the virgin crimson of
         modesty.                                 --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crimson \Crim"son\, a.
   Of a deep red color tinged with blue; deep red. "A crimson
   tide." --Mrs. Hemans.
   [1913 Webster]

         The blushing poppy with a crimson hue.   --Prior.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crimson \Crim"son\, v. t. [imp. & p. p. Crimsoned (-z'nd); p.
   pr. & vb. n. Crimsoning.]
   To dye with crimson or deep red; to redden.
   [1913 Webster]

         Signed in thy spoil and crimsoned in thy lethe. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crimson \Crim"son\, v. t.
   To become crimson; to blush.
   [1913 Webster]

         Ancient towers . . . beginning to crimson with the
         radiant luster of a cloudless July morning. --De
                                                  Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crimson
    adj 1: of a color at the end of the color spectrum (next to
           orange); resembling the color of blood or cherries or
           tomatoes or rubies [syn: red, reddish, ruddy,
           blood-red, carmine, cerise, cherry, cherry-red,
           crimson, ruby, ruby-red, scarlet]
    2: 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 [syn: crimson, red, violent]
    3: (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"
       [syn: crimson, red, reddened, red-faced, flushed]
    n 1: a deep and vivid red color [syn: crimson, ruby, deep
         red]
    v 1: turn red, as if in embarrassment or shame; "The girl
         blushed when a young man whistled as she walked by" [syn:
         blush, crimson, flush, redden]