THESAURUS
tightening
accelerando, acceleration, aggravation, beefing-up, blowing up, blowup, clamping, clamping down, compression, concentration, condensation, consolidation, crescendoing, crescent, crush, deepening, enhancement, exacerbation, exaggeration, expanding, explosion, growing, heating-up, heightening, increasing, incremental, information explosion, intensification, intensifying, lengthening, magnification, multiplying, nip, on the increase, pickup, pinch, population explosion, press, pressure, proliferating, redoubling, reinforcement, snowballing, speedup, spreading, squeeze, squeezing, step-up, strengthening, swelling, tweak, waxing
