soar, skyrocket, dwindle, nose dive, plunge, tumble, rise, drop, decline, stagnate, fall, erode, shrivel, sag, dip, evaporate, tanked, shrink, slumped, climb, slide, crumble, depress, deteriorate, sputter, implode, sink, hover, rocketing, collapse, falter, vanish, disintegrate, slipping, disappear, lose, outstrip, languish, spiked, wane, halved, wither, teeter, decimate, swoon, peaked, stumble, surging, fluctuate, drift, swell, creep, diminish, increase, spiraling, outpace, decrease, quadrupled, weaken, wobble, jump, careen, recede, regress, skidding, roil, droop, trebled, lagging, crumple, tripling, flatten, deplete, decelerate, suffer, inflate, explode, devastate, leapt, souring, slash, dive, escalate, resurge, worsen, sapped, backslide, convulse, depreciate, grow, floundering, lurch, overinflated, fizzle, drags, hurtle, burgeon, totter, ravage, pummel, battering, hemorrhaging

perpendicular, plumb line

bob

plumb, plumb bob, plump