WordNet (r) 3.0 (2006):

bear out
    v 1: support with evidence or authority or make more certain or
         confirm; "The stories and claims were born out by the
         evidence" [syn: corroborate, underpin, bear out,
         support]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "bear out":
   affirm, afford support, attest, authenticate, back, back up, bear,
   bear up, bolster, bolster up, buttress, certify, circumstantiate,
   confirm, corroborate, crutch, document, finance, fortify, fund,
   give support, hold up, justify, keep, lend support, maintain,
   probate, prop, prop up, prove, ratify, reinforce, shore, shore up,
   strengthen, subsidize, substantiate, subvention, subventionize,
   support, sustain, undergird, upbear, uphold, upkeep, validate,
   verify, warrant