WordNet (r) 3.0 (2006):

stand still
    v 1: remain in place; hold still; remain fixed or immobile;
         "Traffic stood still when the funeral procession passed by"
         [ant: move]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "stand still":
   abide, be conservative, be still, coast, do nothing, freeze,
   keep quiet, leave alone, let alone, let be, lie still, mark time,
   not breathe, not stir, oppose change, remain, remain motionless,
   repose, rest, stand, stand fast, stand firm, stand pat, stay,
   stay put, stick, stick fast, tarry, tread water