Synonyms and related words :
accelerate, aggrandize, aggravate, augment, blow up, boost, brace, brace up, buttress, case harden, complicate, concentrate, condense, confirm, consolidate, deepen, double, enhance, enlarge, exacerbate, exaggerate, expand, extend, fortify, gird, harden, heat up, heighten, hop up, hot up, intensify, invigorate, jazz up, key up, magnify, make complex, multiply, nerve, prop, ramify, redouble, refresh, reinforce, reinvigorate, restrengthen, sharpen, shore up, soup up, steel, step up, stiffen, strengthen, support, sustain, temper, toughen, triple, undergird, whet