deteriorate,
lapse,
relapse,
decline,
set someone back,
revert,
degenerate,
worsen,
regress,
slide back,
fall (into decline),
take a turn for the worse,
suffer a relapse,
get ill again,
slip back,
backslide,
get worse,
act up,
test (positive) seize,
hack,
choke,
contract,
shake,
quiver,
stink,
smell,
bleed,
flail,
tremble,
shrink,
dilate,
riddle,
leak,
flare,
pale,
discolor,
impair,
inflame,
hurt,
putrefy,
convulse,
vomit,
swell,
fester,
dehydrate,
give off (an odor),
bloat,
malinger,
wheeze,
pass out,
faint,
break out in,
erupt in (hives),
slough off (skin),
sink into (a coma),
grow (a tumor),
metastasize,
distend,
pus,
rattle (lungs),
struggle for air,
hemorrhage spread,
destroy,
compromise,
trigger,
transmit,
cover,
riddle,
weaken,
jeopardize,
impair,
obstruct,
devastate,
destabilize,
eat away at,
debilitate,
infest,
reduce to,
putrefy,
aggravate,
exacerbate,
tax (an organ),
wither (a limb),
attack (the immune system),
infect,
afflict