downward trend (?.)
- cascade
- cataract
- chute
- collapse
- comedown
- crash
- debacle
- debasement
- decadence
- decadency
- declension
- declination
- decline
- defluxion
- deformation
- degeneracy
- degenerateness
- degeneration
- degradation
- demotion
- depravation
- depravedness
- depreciation
- derogation
- descending
- descension
- descent
- deterioration
- devolution
- down
- downbend
- downcome
- downcurve
- downfall
- downflow
- downgrade
- downpour
- downrush
- downtrend
- downturn
- downward mobility
- drop
- dropping
- dying
- ebb
- effeteness
- fading
- failing
- failure
- failure of nerve
- fall
- falling
- falling-off
- gravitation
- inclination
- involution
- lapse
- loss of tone
- plummeting
- pounce
- rapids
- regression
- retrocession
- retrogradation
- retrogression
- slippage
- slump
- stoop
- swoop
- wane
- waterfall