noun

the process of becoming progressively worse.

a deterioration in the condition of the patient

worsening,decline,decay,collapse,failure,fall,drop,downturn,slump,slip,slide,stagnation,waning,ebb,retrogression,degradation,degeneration,breakdown,decomposition,rot,putrefaction,spoliation,perishing,withering,atrophy,weakening,fading,break-up,disintegration,dilapidation,crumbling,falling down,falling apart,falling to pieces,corruption