annul, asphyxiate, befool, bottle up, bring to nothing, buffer, cancel, cancel out, censor, check, choke off, clamp down on, come to nothing, constipate, cork, cork up, counterbalance, crack down on, crush, damp down, deaden, discourage, drown, dull, dupe, enfeeble, extinguish, frustrate, gag, gull, hold down, impair, infatuate, inhibit, invalidate, jump on, keep down, keep under, kill, muzzle, negate, negativate, negative, neutralize, nullify, offset, pour water on, put down, put on, quash, quell, quench, repress, restrain, shut down on, silence, sit down on, sit on, smash, smother, squash, squelch, stagnate, stanch, stifle, strangle, stunt, subdue, suffocate, suppress, throttle, thwart, trammel, undo, vitiate, void, weaken