THESAURUS
fortify
add to, adulterate, affirm, animate, arm, armor, armor-plate, arouse, attest, augment, authenticate, back, back up, bank, barricade, bastardize, battle, bear out, beef up, blockade, bolster, boost, brace, brace up, brisk, brisken, buck up, bulwark, buoy, buttress, case harden, castellate, certify, cheer, chirk up, circumstantiate, confirm, contaminate, corroborate, corrupt, crenellate, cut, debase, denaturalize, denature, dig in, dilute, doctor, doctor up, document, embattle, embolden, encourage, energize, enhance, enliven, enrich, entrench, exhilarate, fence, fresh up, freshen, freshen up, garrison, gird, harden, hearten, increase, invigorate, lace, man, man the garrison, mine, nerve, palisade, perk up, pick up, 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, set up, shore up, spike, steel, stiffen, stimulate, stir, strengthen, substantiate, supplement, support, sustain, tamper with, temper, toughen, undergird, uphold, validate, verify, vivify, wall, warrant, water, water down
ROGET THESAURUS
fortify
Strength
VB
be strong, be stronger, overmatch, render strong, give strength, strengthen, invigorate, brace, nerve,
fortify, sustain, harden, case harden, steel, gird, screw up, wind up, set up, gird up one's loins, brace up one's loins, recruit, set on one's legs, vivify, refresh, refect, reinforce, reenforce.