falter, fizzle, splutter, stagnate, stumble, dwindle, plummet, shrivel, sluggish, sag, evaporate, implode, humming, anemic, fade, nose dive, swoon, crumble, disintegrate, soar, vanish, nosedive, misfire, bleed, wane, limp, slow, wither, whimper, steamroll, deflate, disappear, pummel, tailspin, wilt, stagnant, deteriorate, fitful, decelerate, chug, roaring, spew, flatline, torpid, sink, regress, moribund, hyperventilate, lackluster, rattle, burgeon, listless, belch, unglued, punchless, erupt, wheezed, droop, tepid, slacken, scream, whine, tanked, skyrocket, revving, sleepwalk, cooled, seethe, screech, subpar, ravage, ripple, flaccid, gangbusters, waver, groan, languish, shrink, explode, upswing, combust, peter, roil, pour, mutter, teeter, howl, underwhelm, careen, steam, gurgle, underachieve, clunks, morph, dawdle, unabated, fret, dissipate, smolder, vex, slumping, whir, crackle, puff, flash, gasp, buzz, exclamation, flicker, flurries, gasps, hiss, puffs, splash, twitter, cry, dabs, flashes, flickering, flutter, fluttering, plasma, cathodic, anodic, ion, laser, beryllium, bombardment, cadmium, dipole, dopant, electrolytic, fibrinous, galvanic, gel, metal, monomolecular, mucopolysaccharide, situ, vapor, wafer

alter, change, climb, cough out, cough up, emit, expectorate, let loose, let out, noise, pop, spit up, utter, utterance

clamber, scramble, shin, shinny, skin, spatter, spattering, spit out, splatter, splattering, sputtering, struggle