compound
confound
kick a dog when it's down
do more harm than good
kick someone when they are down
disimprove
worsen
exacerbate
aggravate
exasperate
rub salt in someone's wounds
fall away
suffer
go from bad to worse
impair
fan the flames
hit one hard
add fuel to the fire
take a turn for the worse
misalter
dismalize
twist the knife
go to shit
make matters worse
pejorate
dub
fossick
drop someone in it
poison
bring down
reap the whirlwind
tread on someone's corns
decline
run
ruin
come to grief
go through hell
rub salt in the wound
deteriorate
blame
make heavy weather of
enervate
catastrophize
raise the spectre
begin at the wrong end
make one's bed and lie in it
pay
malice
bear the brunt
visit