Sentence:  Isn't it horrible, mamma! One fly produces fifty-two billions of descendants in 60 days in June and July, and they go and crawl over sick people and wade through pus, and sputa, and foul matter exuding from sores, and <WSD>gaum</WSD> themselves with every kind of disease-germ, then they go to everybody's dinner-table and wipe themselves off on the butter ... 
Meaning of the word marked with <WSD> tags:  To smear.