Answer: avouch

AnswerCrossword Clue
AVOUCHDeclare the provable truth
AVOUCHGuarantee
AVOUCHAffirm
AVOUCHCorroborate
AVOUCHAffirm openly.
AVOUCHGuarantee.
AVOUCHAssert positively
AVOUCHAffirm as true
AVOUCHAffirm frankly
AVOUCHDeclare firmly
avouchto assume responsibility for; vouch for; guarantee
avouchto make frank acknowledgment or affirmation of; declare or assert with positiveness
avouchto admit; confess
avouchto affirm (to state positively)