avalanche, coast, comedown, debasement, decadence, decadency, declension, declination, decline, deformation, degeneracy, degenerateness, degeneration, degradation, demotion, depravation, depravedness, depreciation, derogation, descent, deterioration, devolution, downtrend, downturn, downward mobility, downward trend, drop, dying, ebb, effeteness, fading, failing, failure, failure of nerve, fall, falling-off, glide, glissade, glissando, involution, landslide, landslip, lapse, loss of tone, regression, retrocession, retrogradation, retrogression, sideslip, skid, slide, slip, slither, slump, snowslide, snowslip, subsidence, wane