Shush

Verb

 * 1)  To be quiet; to keep quiet.
 * The shushing was louder than the children's whispers had been.

Thesaurus
assibilate, assibilation, black out, buzz, censor, choke, choke off, dumbfound, effervesce, effervescence, effervescing, fizz, fizzle, fizzling, frication, frictional rustling, gag, hiss, hissing, hugger-mugger, hush, hush up, hush-hush, hushing, kill, lisp, muffle, muzzle, put to silence, quash, quiet, quieten, repress, rhonchus, shushing, shut down on, shut up, sibilance, sibilate, sibilation, siffle, sigmatism, silence, siss, sissing, sit on, sizz, sizzle, sizzling, smother, sneeze, sneezing, sniff, sniffle, snore, snort, snuff, snuffle, soft-pedal, spit, splutter, sputter, squash, squelch, squish, sternutation, stertor, stifle, still, strangle, strike dumb, suppress, swish, throttle, wheeze, whish, whistle, whistling, white noise, whiz, whoosh, zip