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