attest

v

1.Usu. attest to

testify, witness, bear witness, evidence, offer evidence, depone, swear to, state under oath, allege, plead; depose, certify, certificate, present an affidavit.

2.Usu. attest to

guarantee, guaranty, insure, ensure, warrant, endorse, vouch for, stand behind or by, back up; promise, pledge, plight, give one's solemn word or promise; assure, offer assurance, asseverate, avouch, aver, affirm.

3. document, circumstantiate, manifest, show, exhibit, display, demonstrate; prove, confirm, bear out, verify, validate, establish, authenticate; corroborate, substantiate, sustain, uphold, vindicate.