abate, abrogate, annihilate, annul, asphyxiate, black out, bottle up, cancel, censor, choke, choke off, clamp down on, cork, cork up, crack down on, crush, damp down, discharge, dissolve, drown, extinguish, gag, hold down, hugger-mugger, hush-hush, hush, hush up, invalidate, jump on, keep down, keep under, kill, muffle, muzzle, negate, nullify, overrule, overthrow, overwhelm, pour water on, put down, put out, quell, quench, reject, repress, rescind, reverse, revoke, set aside, shush, shut down on, silence, sit down on, sit on, smash, smother, snuff out, squash, squelch, stamp out, stanch, stifle, strangle, stultify, subdue, suffocate, suppress, throttle, throw out, trample out, trample underfoot, undo, vacate, vitiate, void