dirtying (part of speech: verb)
- Miles away they could see smoke befouling the blue of the sky. - "'Firebrand' Trevison", Charles Alden Seltzer.
- The filthiness that the Germans use, their deliberate befouling of all that is elegant and gracious and antique, their spitting into the food that is to be eaten by their prisoners, their defiling with ordure the sacred vessels in the churches- all these things, too numerous and too monotonous to describe, are not the instinctive coarsenesses of the brute beast; they are a solemn ritual of filth, religiously practised, by officers no less than by men. - "England and the War", Walter Raleigh.
- Grim and relentless, it is beautiful at all times until man puts his befouling hand upon the landscape it paints in street and alley, where poetry is never at home in summer. - "Children of the Tenements", Jacob A. Riis.