accelerando, accelerate, acceleration, accost, advance, aggravate, aggravation, amplify, approach, appropinquate, approximate, bear down on, bear down upon, bear up, beef up, beefing-up, blow up, blowing up, blowup, charge, close, close in, close with, come, come closer, come forward, come near, come on, come up, complicate, concentrate, concentration, condensation, condense, confront, consolidate, consolidation, crack on, deepen, deepening, double, draw near, draw nigh, drive, electrify, encounter, energize, enhance, enhancement, exacerbate, exacerbation, exaggerate, exaggeration, explosion, gain ground, gain upon, galvanize, generate, getaway, hasten, heat up, heating-up, heighten, heightening, hop up, hot up, hurry, hurry up, impetus, information explosion, intensification, intensify, jazz up, key up, loop in, magnification, magnify, make complex, narrow the gap, near, open the throttle, pick up speed, pickup, plug in, population explosion, proximate, put on, put on steam, quicken, quickening, race, ramify, redouble, redoubling, reinforce, reinforcement, rev, shake up, sharpen, shock, short-circuit, short, sidle up to, soup up, speed up, speedup, step down, step on it, stiffen, strengthen, strengthening, switch off, switch on, thrust, tightening, triple, turn off, turn on, whet