WordNet (r) 3.0 (2006):

go out
    v 1: move out of or depart from; "leave the room"; "the fugitive
         has left the country" [syn: exit, go out, get out,
         leave] [ant: come in, enter, get in, get into,
         go in, go into, move into]
    2: leave the house to go somewhere; "We never went out when our
       children were small"
    3: take the field; "The soldiers went out on missions"
    4: become extinguished; "The lights suddenly went out and we
       were in the dark"
    5: go out of fashion; become unfashionable [ant: come in]
    6: date regularly; have a steady relationship with; "Did you
       know that she is seeing an older man?"; "He is dating his
       former wife again!" [syn: go steady, go out, date,
       see]

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "go out":
   be all over, be lost, be no more, be superseded, become extinct,
   become void, blow over, bow out, boycott, burn out, carry,
   carry out, cease to be, cease to live, cover, decease, depart,
   depart this life, die, die away, die out, egress, encompass,
   environ, exit, expire, extend, extend out, fall, fall asleep,
   fall into disuse, fizzle, fizzle out, flame out, get out, go,
   go on strike, have it, have its time, hold, hold out, lapse, lie,
   lock out, make an exit, march out, obsolesce, outdistance, outlie,
   outrange, outstretch, part, pass, pass away, pass on, pass out,
   pass over, perish, picket, put off mortality, quit this world,
   range, range out, reach, reach out, return to dust, revolt, run,
   run its course, run out, shut it down, sit down, slow down, span,
   spread, stop breathing, straddle, stretch, stretch out, strike,
   succumb, superannuate, surround, sweep, take in, thrust out,
   up and die, walk out, wear away, wear off, yield the ghost