dirtying
NounWordNet 3.0
Webster's Dictionary (GCIDE)
1.To foul; to make filthy; to soil; as, to dirty the clothes or hands. [1913 Webster]
2.To tarnish; to sully; to scandalize; -- said of reputation, character, etc. [1913 Webster]
dirtying \dirtying\ n. the act of soiling something.
Syn: soiling, soilure. [WordNet 1.5]