Definition of "begrimed"

I knew Mr. Rochester; though the begrimed face, the disordered dress […] , the desperate and scowling countenance, the rough, bristling hair might well have disguised him.

1847, Charlotte Brontë, chapter 18, in Jane Eyre‎

Trees, trees, millions of trees, massive, immense, running up high; and at their foot, hugging the bank against the stream, crept the little begrimed steamboat, like a sluggish beetle crawling on the floor of a lofty portico.

1899 March, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number MI, New York, N.Y.: The Leonard Scott Publishing Company, […], part II

One [old passenger coach], still used as a summer house, has been stripped of its wheels and repainted fairly recently in bright green, while the other, still in begrimed olive-green, has descended to the level of a chicken house.

1951 February, “Notes and News: Lynton & Barnstaple Remains”, in Railway Magazine, page 136

[…] he was surprised to find some half-eaten stringbeans and a crushed pack of cigarettes in the garbage pail. Though he was tempted to salvage the half-empty pack, it was already much too begrimed.

1989, A. B. Yehoshua, translated by Hillel Halkin, Five Seasons‎, Doubleday, Part 4, Chapter 25, p. 277