WordNet (r) 3.0 (2006):

stand pat
    v 1: refuse to abandon one's opinion or belief [syn: stand
         pat, stand firm, hold firm, stand fast]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "stand pat":
   ante, ante up, back, balk, be conservative, be unflappable, bet,
   bet on, call, cover, die hard, do nothing, fade, gamble,
   get home free, hazard, hold fast, hold out, hold up, lay,
   lay a wager, lay down, leave alone, let alone, let be, make a bet,
   meet a bet, not budge, oppose change, parlay, pass, persevere,
   play against, plunge, punt, remain firm, ride it out, see, stake,
   stand fast, stand firm, stand out, stand still, stay put,
   stick it out, stickle, take no denial, wager, weather,
   weather the storm