Attest

مترادف و متضاد attest

1. verb affirm, vouch for
   Synonyms: adjure, announce, argue, assert, asservate, authenticate, aver, bear out, bear witness, certify, confirm, corroborate, countersign, declare, demonstrate, display, exhibit, give evidence, indicate, prove, ratify, seal, show, substantiate, support, sustain, swear, testify, uphold, verify, warrant, witness
   Antonyms: deny