Waterloo
beating
bloodless revolution
bouleversement
breakdown
breaking up
breakup
cascade
cataclysm
cataract
catastrophe
cave
cave-in
chute
clean slate
clean sweep
collapse
comedown
computer revolution
conquering
conquest
convulsion
counterrevolution
crack-up
crash
deathblow
declension
declination
defeasance
defeat
defluxion
descending
descension
descent
destruction
disaster
down
downbend
downcome
downcurve
downfall
downflow
downgrade
downpour
downrush
downtrend
downturn
downward trend
drop
alluvion
deluge
flood
inundation
licking
fiasco
implosion
meltdown
setback
upheaval
cockle
gonococcal
mochel
rockel