1 trample on or upon, tramp (on or upon), stamp (on), tread (on), step on, crush, press, squash, flatten, Colloq stomp (on or upon), squish, squush or squoosh:
After the harvest, we would take turns trampling the grapes.
2 Often, trample on or upon. violate, damage, harm, hurt, infringe or encroach on, ride roughshod over, set at naught, scorn, contemn, disdain, defy, disregard, ignore, fly in the face of, fling or cast or throw to the winds:
The military regime trampled on the people's civil rights.
3 Usually, trample out. trample down, trample underfoot, stamp out, extinguish, put out, destroy, crush, break down:
The left-wing parties were trampled in a military coup.