run
disimprove
drop behind
take a turn for the worse
exacerbate
do more harm than good
alter
kick someone when they are down
worsen
make heavy weather of
decline
go backwards
pejorate
fall
misalter
change
confound
impair
make matters worse
ameliorate
suffer
deteriorate
crash
fall away
compound
go south
diverge
go from bad to worse
poison
misfall
stick out a mile
decay
kick a dog when it's down
aggravate
rub salt in someone's wounds
maladjust
change tack
misincline
blow off course
rot in hell
switch up
miscompensate
take its toll
sux0r
misdevelop
dig one's own grave
hit
induratize
sugar
fritz
exasperate
eventuate
acidulate
compensate
fall prey
ruin
have one foot on a banana peel