Lewis & Short

sub-sto, āre, v. n.

  1. I. To stand or be under or among, to be present (very rare; not in Cic.): si pure substante non rumpuntur hi tumores, Cels. 6, 10 med.: nullo dolore substante, id. 2, 7 med.; 2, 12, 2.
  2. * II. To stand firm, hold out, = subsisto: metuo, ut substet hospes, Ter. And. 5, 4, 11.