belch, burst, cascade, cataract, chute, collapse, comedown, crash, debacle, debouchment, declension, declination, defluxion, descending, descension, descent, dissiliency, down, downbend, downcome, downcurve, downfall, downflow, downgrade, downpour, downrush, downtrend, downturn, downward trend, drop, dropping, eructation, eruption, fall, falling, flare-up, gravitation, gush, inclination, jet, outbreak, outburst, plummeting, pounce, rapid, riff, riffle, ripple, rush, sault, shoot, spate, spew, spurt, stoop, swoop, torrent, volcan, waterfall