slipping back (verb) relapse: deteriorate, weaken
Sinonime: backslide, be overcome, be overtaken,
degenerate,
fade,
fail,
fall, fall back,
lapse, recidivate,
regress, retrogress,
revert, sicken,
sink, slide back, slip back,
suffer, turn back,
worsenAntonime: get better,
heal,
progress,
strengthen