avouch (v.)

• acknowledge
• admit
• affirm
• allege
• announce
• annunciate
• argue
• assert
• asseverate
• assure
• attest
• aver
• avow
• certify
• confess
• confirm
• contend
• corroborate
• countersign
• declare
• depone
• depose
• disclose
• enunciate
• express
• guarantee
• have
• hold
• insist
• maintain
• own
• pledge
• plight
• predicate
• proclaim
• profess
• promise
• pronounce
• protest
• put
• say
• speak
• state
• submit
• swear
• testify
• troth
• underwrite
• vouch
• vow
• warrant
• witness