fortify (v.)

• adulterate
• affirm
• animate
• arm
• armor
• arouse
• attest
• augment
• authenticate
• back
• bank
• barricade
• bastardize
• battle
• blockade
• bolster
• boost
• brace
• brisk
• brisken
• bulwark
• buoy
• buttress
• certify
• cheer
• circumstantiate
• confirm
• contaminate
• corroborate
• corrupt
• crenellate
• cut
• debase
• denaturalize
• denature
• dilute
• doctor
• document
• embattle
• embolden
• encourage
• energize
• enhance
• enliven
• enrich
• entrench
• exhilarate
• fence
• freshen
• garrison
• gird
• harden
• hearten
• increase
• invigorate
• lace
• man
• mine
• nerve
• palisade
• pollute
• prepare
• probate
• prop
• prove
• quicken
• rally
• ratify
• ready
• reanimate
• reassure
• recreate
• recruit
• refresh
• refreshen
• regale
• reinforce
• reinvigorate
• renew
• restore
• restrengthen
• revive
• revivify
• rouse
• secure
• spike
• steel
• stiffen
• stimulate
• stir
• strengthen
• substantiate
• supplement
• support
• sustain
• temper
• toughen
• undergird
• uphold
• validate
• verify
• vivify
• wall
• warrant
• water