/gruym/ , n. , v. , grimed, griming .
n.
1. dirt, soot, or other filthy matter, esp. adhering to or embedded in a surface.
v.t.
2. to cover with dirt; make very dirty; soil.
[ 1250-1300; ME grim; appar. special use of OE grima mask, to denote layer of dust; cf. dial. D grijm ]