To forge a pathway by walking on top of vegetation until it is permanently flattened or destroyed. The elephants have trampled out a path that they follow every single year. The kids have run back and forth between the two yards so frequently that they've trampled a little pathway out.
trample something out
to create a pathway by marching or stamping the same trail over and over. The mail carriers have trampled a path out through my marigolds! Jim trampled out a path in my garden.