verify (v.)

• affirm
• assay
• attest
• audit
• authenticate
• back
• balance
• bolster
• buttress
• certify
• check
• circumstantiate
• clench
• clinch
• collate
• confirm
• corroborate
• cross-check
• demonstrate
• document
• double-check
• essay
• establish
• experiment
• fortify
• guarantee
• inventory
• justify
• overhaul
• probate
• prove
• ratify
• reinforce
• research
• sample
• settle
• show
• strengthen
• substantiate
• support
• sustain
• taste
• test
• try
• undergird
• uphold
• validate
• warrant