Synonyms and related words :
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