To trample is to forcefully walk right over something or someone. If you fall down during a footrace, another runner might trample you.
When you trample, you're stomping or stamping: it's the opposite of walking on tippy toes. A dog might trample a flower garden while chasing a ball, and an angry child might deliberately trample her sister's sandcastle, flattening it with her feet. The verb trample comes from tramp, "walk heavily or stamp," which is rooted in the Middle Low German word trampen, "to tramp, stamp, or press upon."