confirm Synonyms

substantiate corroborate sustain support establish ratify assure settle verify affirm reassert verified vouch testify toughen undergird underpin undersign underwrite visa upbear uphold vindicate vindicated validate supported reconfirm reinforce restrengthen sanction seal secure see nonspeaking shown showing show strengthen subcontract subscribe frapping reaffirm warrant to strengthen ruggedize rubberstamp get behind book up take stock nail down