testify (v.)

• acknowledge
• affirm
• allege
• announce
• argue
• assert
• asseverate
• assure
• attest
• aver
• avouch
• avow
• bespeak
• betoken
• book
• certify
• characterize
• connote
• declare
• demonstrate
• denominate
• denote
• depone
• depose
• differentiate
• disclose
• display
• entail
• express
• guarantee
• highlight
• hint
• identify
• indicate
• involve
• manifest
• mark
• mean
• mount
• note
• proclaim
• prove
• reveal
• say
• show
• signify
• state
• suggest
• swear
• vouch
• vouchsafe
• vow
• warrant
• witness