Synonyms and related words :
add to, aggrandize, amplify, augment, boost, broaden, build, build up, continue, dawdle, drag out, draw, draw out, dwell on, elongate, enlarge, exalt, expand, extend, fatten, fill out, hike, hike up, hold, increase, inflate, jack up, jump up, keep, keep alive, keep going, keep up, lengthen out, let out, linger on, maintain, maximize, parlay, perpetuate, preserve, procrastinate, produce, prolong, prolongate, protract, pull, put up, pyramid, raise, retain, spin out, strain, stretch, stretch out, string out, sustain, tauten, temporize, tense, thicken, tighten, up