Source : Webster's Revised Unabridged Dictionary (1913)

Grime \Grime\, v. t.
   To sully or soil deeply; to dirt. --Shak.

Grime \Grime\, n. [Cf. Dan. grim, griim, lampblack, soot, grime,
   Icel. gr[imac]ma mask, sort of hood, OD. grijmsel, grimsel,
   soot, smut, and E. grimace.]
   Foul matter; dirt, rubbed in; sullying blackness, deeply
   ingrained.

Source : WordNet®

grime
     n : the state of being covered with unclean things [syn: {dirt},
          {filth}, {soil}, {stain}, {grease}, {grunge}]

grime
     v : make soiled, filthy, or dirty; "don't soil your clothes when
         you play outside!" [syn: {dirty}, {soil}, {begrime}, {colly},
          {bemire}] [ant: {clean}]