verb
level, level off, level out, even out, even, smooth, smooth out, spread out, depress, squash, smash, crush, raze, bulldoze, steamroller, debase, prostrate, knock down, wear down, beat down, fell, floor, ground, abrade, roll out, straighten, grade, plane, deflate, plaster down; see also fell.
Antonyms raise*, elevate, inflate.