vouch

v

1.Usu. vouch for

endorse, support, back up, stand behind or by; sponsor, countersign, witness, sign for, answer for, subscribe, undersign, co-sign.

2.Often vouch for

guarantee, ensure, secure, Finance. bond, Law. mortgage; insure, indemnify, underwrite; assure, offer assurance, avow, asseverate, vow, give one's solemn word or promise, state on one's honor, pledge, swear to, state under oath, Inf. promise.

3.Often vouch for

certify, certificate, warrant, confirm, verify, validate, authenticate; attest to, testify to, avouch, affirm, assert, declare, state emphatically, say for certain or sure; corroborate, substantiate, sustain, uphold; prove, document, establish, manifest, show, demonstrate; depose, bear witness, evidence, offer evidence.

4. adduce, cite, quote, draw on, invoke