assure (v.)

• ascertain
• assert
• asseverate
• attest
• avouch
• back
• bolster
• bond
• book
• certify
• cheer
• cinch
• clinch
• comfort
• confirm
• console
• convert
• convict
• convince
• countersign
• decide
• depone
• depose
• determine
• ease
• embolden
• encourage
• endorse
• ensure
• establish
• fix
• guarantee
• hearten
• inspire
• inspirit
• insure
• nerve
• persuade
• pledge
• plight
• promise
• reassure
• relieve
• satisfy
• secure
• sell
• settle
• sign
• solace
• sponsor
• stabilize
• state
• support
• swear
• testify
• troth
• undersign
• underwrite
• vouch
• vow
• warrant