affirm (v.)

• accept
• accredit
• acknowledge
• allege
• announce
• annunciate
• approve
• argue
• assert
• asseverate
• attest
• authenticate
• authorize
• autograph
• aver
• avouch
• avow
• back
• bolster
• buttress
• certify
• circumstantiate
• confess
• confirm
• contend
• corroborate
• cosign
• countersign
• declare
• depone
• depose
• disclose
• document
• endorse
• enunciate
• express
• fortify
• guarantee
• have
• hold
• initial
• insist
• maintain
• notarize
• pass
• permit
• predicate
• probate
• proclaim
• profess
• pronounce
• protest
• prove
• put
• quote
• ratify
• recite
• reinforce
• relate
• report
• sanction
• say
• seal
• second
• sign
• speak
• state
• strengthen
• submit
• substantiate
• support
• sustain
• swear
• testify
• undergird
• undersign
• underwrite
• uphold
• validate
• verify
• visa
• vise
• vouch
• vow
• warrant
• witness