spread, distribute - distribute or disperse widely; "The invaders spread their language all over the country"

percolate - spread gradually; "Light percolated into our house in the morning"

grow over, creep - grow in such a way as to cover (a building, for example); "ivy grew over the walls of the university buildings"

bleed, run - be diffused; "These dyes and colors are guaranteed not to run"

mantle - spread over a surface, like a mantle