subsidency
avalanche
cadence
catabasis
catenary
cessation
coast
collapse
crash
dead set
dead stand
dead stop
deadlock
deceleration
declension
decline
decline and fall
decrescendo
decurrence
diminuendo
dive
downtrend
downturn
droop
drop
dwindling
dying down
ebb
ebbing
fall
full stop
glide
glissade
glissando
halt
landslide
landslip
lapse
lock
lowering
plunge
remission
retreat
sag
sideslip
sinkage
skid
slide
slip
slippage
slither
sinking
assuagement
denudation
diminution
erosion
impoverishment
inundation
sedimentation
shading
shrinkage
upheaval
weaken
guidance