The Collaborative International Dictionary of English v.0.48:

Imbrue \Im*brue"\, v. t. [imp. & p. p. Imbureed; p. pr. & vb.
   n. Imbureing.] [Cf. OF. embruer, also embruver, embreuver,
   embrever, to give to drink, soak (see pref. En-, 1, 1st
   In-, and Breverage), but also OE. enbrewen, enbrowen, to
   stain, soil (cf. Brewis).]
   To wet or moisten; to soak; to drench, especially in blood.
   [1913 Webster]

         While Darwen stream, will blood of Scots imbrued.
                                                  --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

imbrue
    v 1: permeate or impregnate; "The war drenched the country in
         blood" [syn: imbrue, drench]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "imbrue":
   bathe, besprinkle, breathe, brew, color, decoct, douche, dredge,
   drench, drouk, dye, entincture, flavor, flush, imbue, impregnate,
   infiltrate, infuse, inject, instill, lave, leach, leaven,
   lixiviate, macerate, penetrate, percolate, permeate, pervade,
   rinse, saturate, season, seethe, soak, sodden, sop, souse, steep,
   suffuse, temper, tincture, tinge, transfuse, wash, waterlog