From WordNet (r) 3.0 (2006):
hush
n 1: (poetic) tranquil silence; "the still of the night" [syn:
hush, stillness, still]
v 1: become quiet or still; fall silent; "hush my baby!"
2: cause to be quiet or not talk; "Please silence the children
in the church!" [syn: hush, quieten, silence, still,
shut up, hush up] [ant: louden]
3: become quiet or quieter; "The audience fell silent when the
speaker entered" [syn: quieten, hush, quiet, quiesce,
quiet down, pipe down] [ant: louden]
4: wash by removing particles; "Wash ores"
5: run water over the ground to erode (soil), revealing the
underlying strata and valuable minerals